chore(CI): simplify testing strategy

Author: MichaelDeBoey

.github/workflows/CI.yml

@@ -13,90 +13,59 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
-        with:
-          fetch-depth: 1
+        uses: actions/checkout@v2
       - name: Install Node.js
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
-          node: 12.x
+          node-version: 16
       - name: Install Packages
         run: npm install
       - name: Lint
         run: npm run -s lint
 
   test:
     name: Test
-
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
-        eslint: [6.x, 5.x]
-        node: [13.x, 12.x, 10.x, 8.x]
-        exclude:
-          # On Windows, run tests with only the latest LTS environments.
-          - os: windows-latest
-            eslint: 6.x
-            node: 13.x
-          - os: windows-latest
-            eslint: 6.x
-            node: 10.x
-          - os: windows-latest
-            eslint: 6.x
-            node: 8.x
-          - os: windows-latest
-            eslint: 5.x
-            node: 13.x
-          - os: windows-latest
-            eslint: 5.x
-            node: 12.x
-          - os: windows-latest
-            eslint: 5.x
-            node: 10.x
-          - os: windows-latest
-            eslint: 5.x
-            node: 8.x
-          # On macOS, run tests with only the latest LTS environments.
-          - os: macOS-latest
-            eslint: 6.x
-            node: 13.x
-          - os: macOS-latest
-            eslint: 6.x
-            node: 10.x
-          - os: macOS-latest
-            eslint: 6.x
-            node: 8.x
-          - os: macOS-latest
-            eslint: 5.x
-            node: 13.x
-          - os: macOS-latest
-            eslint: 5.x
-            node: 12.x
-          - os: macOS-latest
-            eslint: 5.x
-            node: 10.x
-          - os: macOS-latest
-            eslint: 5.x
-            node: 8.x
-          # Run ESLint 5.x tests on only the latest LTS Node.
-          - os: ubuntu-latest
-            eslint: 5.x
-            node: 13.x
-          - os: ubuntu-latest
-            eslint: 5.x
-            node: 10.x
-          - os: ubuntu-latest
-            eslint: 5.x
-            node: 8.x
+        os: [ubuntu-latest]
+        eslint: [6]
+        node: [16]
+        include:
+          # On other platforms
+          - eslint: 6
+            node: 16
+            os: windows-latest
+          - eslint: 6
+            node: 16
+            os: macos-latest
+          # On old Node.js versions
+          - eslint: 6
+            node: 14
+            os: ubuntu-latest
+          - eslint: 6
+            node: 12
+            os: ubuntu-latest
+          - eslint: 6
+            node: 10
+            os: ubuntu-latest
+          - eslint: 6
+            node: 8
+            os: ubuntu-latest
+          # On old ESLint versions
+          - eslint: 5
+            node: 16
+            os: ubuntu-latest
+          # On the minimum supported ESLint/Node.js version
+          - eslint: 5.16.0
+            node: 8.10.0
+            os: ubuntu-latest
 
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
-        with:
-          fetch-depth: 1
+        uses: actions/checkout@v2
       - name: Install Node.js ${{ matrix.node }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
       - name: Install Packages