Allow Node 14.x (facebook#18755)

Author: bl00mber

package.json

@@ -93,7 +93,7 @@
     "webpack": "^4.41.2"
   },
   "devEngines": {
-    "node": "8.x || 9.x || 10.x || 11.x || 12.x || 13.x"
+    "node": "8.x || 9.x || 10.x || 11.x || 12.x || 13.x || 14.x"
   },
   "jest": {
     "testRegex": "/scripts/jest/dont-run-jest-directly\\.js$"