chore(package): update @types/react-native to version 0.60.12

Closes #18

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "@types/enzyme-adapter-react-16": "^1.0.5",
     "@types/jest": "^24.0.11",
     "@types/react": "^16.8.19",
-    "@types/react-native": "^0.57.40",
+    "@types/react-native": "^0.60.12",
     "coveralls": "^3.0.3",
     "enzyme": "^3.9.0",
     "enzyme-adapter-react-16": "^1.11.2",