run action with specific version of Vim and Neovim on CI

Author: rhysd

.github/workflows/ci.yml

@@ -7,8 +7,15 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        version: [stable, nightly]
+        version: [stable, nightly, v8.1.2424, v0.4.0]
         neovim: [true, false]
+        exclude:
+          - { neovim: true, version: v8.1.2424, os: ubuntu-latest }
+          - { neovim: true, version: v8.1.2424, os: macos-latest }
+          - { neovim: true, version: v8.1.2424, os: windows-latest }
+          - { neovim: false, version: v0.4.0, os: ubuntu-latest }
+          - { neovim: false, version: v0.4.0, os: macos-latest }
+          - { neovim: false, version: v0.4.0, os: windows-latest }
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2

.yamllint.yml

@@ -4,3 +4,6 @@ rules:
   line-length: disable
   document-start: disable
   truthy: disable
+  braces:
+    min-spaces-inside: 1
+    max-spaces-inside: 1