chore(CI): simplify testing strategy

.github/workflows/CI.yml

@@ -10,21 +10,35 @@ on:
 jobs:
   test:
     name: Test
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [12.x, 10.x, 8.x]
+        os: [ubuntu-latest]
+        eslint: [6]
+        node: [8, 10, 12, 14, 16, 18]
+        include:
+          # On other platforms
+          - os: windows-latest
+            node: 18
+          - os: macos-latest
+            node: 18
+          # On the minimum supported ESLint/Node.js version
+          - eslint: 6.6.0
+            node: 8.10.0
+
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
-        with:
-          fetch-depth: 1
+        uses: actions/checkout@v3
       - name: Install Node.js ${{ matrix.node }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node }}
       - name: Install Packages
         run: npm install
+        env:
+          CI: true
+      - name: Install ESLint@${{  matrix.eslint  }}
+        run: npm install eslint@${{  matrix.eslint  }}
       - name: Test
         run: npm test
       - name: Send Coverage