Update CI (clean-css#50)

* specify `fail-fast: false`
* update to `actions/setup-node@v2`
* fix indentation

Author: XhmikosR

.github/workflows/node.js.yml

@@ -5,25 +5,25 @@ name: x86 Linux build
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
         node-version: [10.x, 12.x, 14.x, 15.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm ci
-    - run: npm test
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test