remove parcel dev dep

Author: staltz

package.json

@@ -29,7 +29,6 @@
     "@types/node": "^10.5.2",
     "@types/react": "16.9.3",
     "mocha": "^6.2.0",
-    "parcel": "^1.12.3",
     "react": "16.9.0",
     "react-dom": "16.9.0",
     "react-test-renderer": "16.9.0",