Upgrade dev & peer dependencies

Author: ethan605

package.json

@@ -20,8 +20,8 @@
   },
   "homepage": "https://github.com/onaclover/react-native-refreshable-list#readme",
   "peerDependencies": {
-    "react": "16.0.0-alpha.6",
-    "react-native": "^0.44.3"
+    "react": "16.0.0-alpha.12",
+    "react-native": "^0.46.3"
   },
   "devDependencies": {
     "babel-eslint": "^7.2.1",