Prevent unwanted crlf conversion

Ref 1. actions/checkout#135
    2. https://prettier.io/docs/en/options.html#end-of-line

.github/workflows/nodejs.yml

@@ -9,7 +9,11 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
-    - uses: actions/checkout@v1
+    - name: Set git to use LF
+      run: |
+        git config --global core.autocrlf false
+        git config --global core.eol lf
+    - uses: actions/checkout@v2
     - name: Use Node.js 12.x
       uses: actions/setup-node@v1
       with: