use Node 14.x for CI

Author: gjsjohnmurray

.github/workflows/main.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 14.x
       - run: npm install
       - run: npm run compile
       - name: npm test
@@ -111,7 +111,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 14.x
       - name: Prepare build
         id: set-version
         shell: bash