Use different icons for feature comparison (#32)

Taken from https://github.com/getzola/zola

Author: mre

README.md

@@ -12,41 +12,41 @@ limiter.
 
 This comparison is made on a best-effort basis. Please create a PR to fix outdated information.
 
-|                      | lychee | awesome_bot | muffet | broken-link-checker | linkinator | linkchecker | markdown-link-check | fink |
-| -------------------- | ------ | ----------- | ------ | ------------------- | ---------- | ----------- | ------------------- | ---- |
-| Language             | Rust   | Ruby        | Go     | JS                  | TypeScript | Python      | JS                  | PHP  |
-| Async/Parallel       | ✔️     | ✔️          | ✔️     | ✔️                  | ✔️         | ✔️          | ✔️                  | ✔️   |
-| Static binary        | ✔️     | ✖️          | ✔️     | ✖️                  | ✖️         | ️ ✖️        | ✖️                  | ✖️   |
-| Markdown files       | ✔️     | ✔️          | ✖️     | ✖️                  | ✖️         | ✖️          | ️ ✔️                | ✖️   |
-| HTML files           | ✔️     | ✖️          | ✖️     | ✔️                  | ✔️         | ✖️          | ✖️                  | ✖️   |
-| Txt files            | ✔️     | ✖️          | ✖️     | ✖️                  | ✖️         | ✖️          | ✖️                  | ✖️   |
-| Website support      | ✔️     | ✖️          | ✔️     | ✔️                  | ✔️         | ✔️          | ✖️                  | ✔️   |
-| Chunked encodings    | ✔️     | **?**       | **?**  | **?**               | **?**      | ✖️          | ✔️                  | ✔️   |
-| GZIP compression     | ✔️     | **?**       | **?**  | ✔️                  | **?**      | ✔️          | **?**               | ✖️   |
-| Basic Auth           | ✔️     | ✖️          | ✖️     | ✔️                  | ✖️         | ✔️          | ✖️                  | ✖️   |
-| Custom user agent    | ✔️     | ✖️          | ✖️     | ✔️                  | ✖️         | ✔️          | ✖️                  | ✖️   |
-| Relative URLs        | ✔️     | ✔️          | ✖️     | ✔️                  | ✔️         | ✔️          | ✔️                  | ✔️   |
-| Skip relative URLs   | ✔️     | ✖️          | ✖️     | **?**               | ✖️         | ✖️          | ✖️                  | ✖️   |
-| Include patterns     | ✔️️     | ✔️          | ✖️     | ✔️                  | ✖️         | ✖️          | ✖️                  | ✖️   |
-| Exclude patterns     | ✔️     | ✖️          | ✔️     | ✔️                  | ✔️         | ✔️          | ✔️                  | ✔️   |
-| Handle redirects     | ✔️     | ✔️          | ✔️     | ✔️                  | ✔️         | ✔️          | ✔️                  | ✔️   |
-| Ignore insecure SSL  | ✔️     | ✔️          | ✔️     | ✖️                  | ✖️         | ✔️          | ✖️                  | ✔️   |
-| File globbing        | ✔️     | ✔️          | ✖️     | ✖️                  | ✔️         | ✖️          | ✔️                  | ✖️   |
-| Limit scheme         | ✔️     | ✖️          | ✖️     | ✔️                  | ✖️         | ✔️          | ✖️                  | ✖️   |
-| [Custom headers]     | ✔️     | ✖️          | ✔️     | ✖️                  | ✖️         | ✖️          | ✔️                  | ✔️   |
-| Summary              | ✔️     | ✔️          | ✔️     | **?**               | ✔️         | ✔️          | ✖️                  | ✔️   |
-| `HEAD` requests      | ✔️     | ✔️          | ✖️     | ✔️                  | ✔️         | ✔️          | ✖️                  | ✖️   |
-| Colored output       | ✔️     | **?**       | ✔️     | **?**               | ✔️         | ✔️          | ✖️                  | ✔️   |
-| [Filter status code] | ✔️     | ✔️          | ✖️     | ✖️                  | ✖️         | ✖️          | ✔️                  | ✖️   |
-| Custom timeout       | ✔️     | ✔️          | ✔️     | ✖️                  | ✔️         | ✔️          | ✖️                  | ✔️   |
-| E-mail links         | ✔️     | ✖️          | ✖️     | ✖️                  | ✖️         | ✔️          | ✖️                  | ✖️   |
-| Progress bar         | ✔️     | ✔️          | ✖️     | ✖️                  | ✖️         | ✔️          | ✔️                  | ✔️   |
-| Retry and backoff    | ✔️     | ✖️          | ✖️     | ✖️                  | ✔️         | ✖️          | ✔️                  | ✖️   |
-| Skip private domains | ✔️     | ✖️          | ✖️     | ✖️                  | ✖️         | ✖️          | ✖️                  | ✖️   |
-| [Use as lib]         | ✖️     | ✔️          | ✖️     | ✔️                  | ✔️         | ✖️          | ✔️                  | ✖️   |
-| Quiet mode           | ✔️     | ✖️          | ✖️     | ✖️                  | ✔️         | ✔️          | ✔️                  | ✔️   |
-| Amazing lychee logo  | ✔️     | ✖️          | ✖️     | ✖️                  | ✖️         | ✖️          | ✖️                  | ✖️   |
-| Config file          | ✔️     | ✖️          | ✖️     | ✖️                  | ✔️         | ✔️          | ✔️                  | ✖️   |
+|                      | lychee  | awesome_bot | muffet   | broken-link-checker | linkinator | linkchecker | markdown-link-check | fink   |
+| -------------------- | ------- | ----------- | -------- | ------------------- | ---------- | ----------- | ------------------- | ------ |
+| Language             | Rust    | Ruby        | Go       | JS                  | TypeScript | Python      | JS                  | PHP    |
+| Async/Parallel       | ![yes]  | ![yes]      | ![yes]   | ![yes]              | ![yes]     | ![yes]      | ![yes]              | ![yes] |
+| Static binary        | ![yes]  | ![no]       | ![yes]   | ![no]               | ![no]      | ️ ![no]     | ![no]               | ![no]  |
+| Markdown files       | ![yes]  | ![yes]      | ![no]    | ![no]               | ![no]      | ![no]       | ️ ![yes]            | ![no]  |
+| HTML files           | ![yes]  | ![no]       | ![no]    | ![yes]              | ![yes]     | ![no]       | ![no]               | ![no]  |
+| Txt files            | ![yes]  | ![no]       | ![no]    | ![no]               | ![no]      | ![no]       | ![no]               | ![no]  |
+| Website support      | ![yes]  | ![no]       | ![yes]   | ![yes]              | ![yes]     | ![yes]      | ![no]               | ![yes] |
+| Chunked encodings    | ![yes]  | ![maybe]    | ![maybe] | ![maybe]            | ![maybe]   | ![no]       | ![yes]              | ![yes] |
+| GZIP compression     | ![yes]  | ![maybe]    | ![maybe] | ![yes]              | ![maybe]   | ![yes]      | ![maybe]            | ![no]  |
+| Basic Auth           | ![yes]  | ![no]       | ![no]    | ![yes]              | ![no]      | ![yes]      | ![no]               | ![no]  |
+| Custom user agent    | ![yes]  | ![no]       | ![no]    | ![yes]              | ![no]      | ![yes]      | ![no]               | ![no]  |
+| Relative URLs        | ![yes]  | ![yes]      | ![no]    | ![yes]              | ![yes]     | ![yes]      | ![yes]              | ![yes] |
+| Skip relative URLs   | ![yes]  | ![no]       | ![no]    | ![maybe]            | ![no]      | ![no]       | ![no]               | ![no]  |
+| Include patterns     | ![yes]️ | ![yes]      | ![no]    | ![yes]              | ![no]      | ![no]       | ![no]               | ![no]  |
+| Exclude patterns     | ![yes]  | ![no]       | ![yes]   | ![yes]              | ![yes]     | ![yes]      | ![yes]              | ![yes] |
+| Handle redirects     | ![yes]  | ![yes]      | ![yes]   | ![yes]              | ![yes]     | ![yes]      | ![yes]              | ![yes] |
+| Ignore insecure SSL  | ![yes]  | ![yes]      | ![yes]   | ![no]               | ![no]      | ![yes]      | ![no]               | ![yes] |
+| File globbing        | ![yes]  | ![yes]      | ![no]    | ![no]               | ![yes]     | ![no]       | ![yes]              | ![no]  |
+| Limit scheme         | ![yes]  | ![no]       | ![no]    | ![yes]              | ![no]      | ![yes]      | ![no]               | ![no]  |
+| [Custom headers]     | ![yes]  | ![no]       | ![yes]   | ![no]               | ![no]      | ![no]       | ![yes]              | ![yes] |
+| Summary              | ![yes]  | ![yes]      | ![yes]   | ![maybe]            | ![yes]     | ![yes]      | ![no]               | ![yes] |
+| `HEAD` requests      | ![yes]  | ![yes]      | ![no]    | ![yes]              | ![yes]     | ![yes]      | ![no]               | ![no]  |
+| Colored output       | ![yes]  | ![maybe]    | ![yes]   | ![maybe]            | ![yes]     | ![yes]      | ![no]               | ![yes] |
+| [Filter status code] | ![yes]  | ![yes]      | ![no]    | ![no]               | ![no]      | ![no]       | ![yes]              | ![no]  |
+| Custom timeout       | ![yes]  | ![yes]      | ![yes]   | ![no]               | ![yes]     | ![yes]      | ![no]               | ![yes] |
+| E-mail links         | ![yes]  | ![no]       | ![no]    | ![no]               | ![no]      | ![yes]      | ![no]               | ![no]  |
+| Progress bar         | ![yes]  | ![yes]      | ![no]    | ![no]               | ![no]      | ![yes]      | ![yes]              | ![yes] |
+| Retry and backoff    | ![yes]  | ![no]       | ![no]    | ![no]               | ![yes]     | ![no]       | ![yes]              | ![no]  |
+| Skip private domains | ![yes]  | ![no]       | ![no]    | ![no]               | ![no]      | ![no]       | ![no]               | ![no]  |
+| [Use as lib]         | ![no]   | ![yes]      | ![no]    | ![yes]              | ![yes]     | ![no]       | ![yes]              | ![no]  |
+| Quiet mode           | ![yes]  | ![no]       | ![no]    | ![no]               | ![yes]     | ![yes]      | ![yes]              | ![yes] |
+| Amazing lychee logo  | ![yes]  | ![no]       | ![no]    | ![no]               | ![no]      | ![no]       | ![no]               | ![no]  |
+| Config file          | ![yes]  | ![no]       | ![no]    | ![no]               | ![yes]     | ![yes]      | ![yes]              | ![no]  |
 
 ## Planned features. Please help out!
 
@@ -108,3 +108,6 @@ you want to help out as well, [go here](https://github.com/sponsors/mre/).
 [filter status code]: https://github.com/tcort/markdown-link-check/issues/94
 [skip private domains]: https://github.com/appscodelabs/liche/blob/a5102b0bf90203b467a4f3b4597d22cd83d94f99/url_checker.go
 [use as lib]: https://github.com/raviqqe/liche/issues/13
+[yes]: ./assets/yes.svg
+[no]: ./assets/no.svg
+[maybe]: ./assets/maybe.svg