add parcel-bundler to devDeps

package.json

@@ -33,6 +33,7 @@
     "jsdom-global": "3.0.2",
     "mocha": "^6.1.4",
     "mock-socket": "^8.0.5",
+    "parcel-bundler": "^1.12.3",
     "standard": "^12.0.1",
     "ts-node": "^8.3.0",
     "typescript": "^3.5.3"