Update README.md

Author: AdorableRedPanda

README.md

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 # AST Visualizer for JS
 
-Paste or type code into the editor and inspect the visualization of generated AST: [AST Visualizer](https://adorableredpanda.github.io/ast-visualization/).
+Paste or type code into the editor and inspect the visualization of generated AST - [AST Visualizer](https://adorableredpanda.github.io/ast-visualization/).
 
 Supports JavaScript (JS), TypeScript (TS), and JSX; requires web workers to be available in the browser.