changed watcher command from startdev to dev

Author: mientjan

example/package.json

@@ -9,7 +9,7 @@
     "android": "node ../bin/copy-to-run.js && react-native-scripts android",
     "ios": "node ../bin/copy-to-run.js && react-native-scripts ios",
     "test": "node node_modules/jest/bin/jest.js --watch",
-    "startdev": "node ../bin/watch.js"
+    "dev": "node ../bin/watch.js"
   },
   "jest": {
     "preset": "jest-expo"