Update to node.js 14 (#339)

Author: stefanbuck

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - run: npm ci
     - run: npm test
       env:

package.json

@@ -37,7 +37,7 @@
     "prettier": "^2.3.0"
   },
   "engines": {
-    "node": "12.x"
+    "node": "14.x"
   },
   "keywords": [],
   "author": "Stefan Buck",