Remove Node 14 from Github action

The chroma-highlight package I refer to only supports node >= 16.

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        node: ["14", "16", "18"]
+        node: ["16", "18"]
     name: Node.js ${{ matrix.node }} on ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -18,6 +18,6 @@ jobs:
           node-version: ${{ matrix.node }}
           # cache: npm
       - run: npm install
-      - run: npm demo
+      - run: npm run demo
 env:
   YARN_GPG: no