Fix GH CI

Author: jridgewell

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         latest-node-version: [20.x]
-        node-version: [18.x, 20.x]
+        node-version: [6.x, 8.x, 10.x, 12.x, 14.x, 16.x, 18.x, 20.x]
 
     steps:
       - uses: actions/checkout@v1
@@ -21,14 +21,11 @@ jobs:
         run: |
           npm install
           npm run build
-          npm run test:coverage
+          npm run test:only
       - name: Switch to Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
       - name: Test legacy node
         run: |
-          npm install [email protected]
-          npm run test:only
-        env:
-          CI: true
+          node dist/gen-mapping.umd.js