Update dependencies to enable Greenkeeper 🌴 (#17)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

Author: greenkeeper[bot]

README.md

@@ -1,4 +1,6 @@
 # react-native-nested-listview
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/fjmorant/react-native-nested-listview.svg)](https://greenkeeper.io/)
 UI component for React Native that allows to create a listview with N levels of nesting
 
 ![platforms](https://img.shields.io/badge/platforms-Android%20%7C%20iOS-brightgreen.svg?style=flat-square)

package.json

@@ -26,7 +26,7 @@
     "eslint-plugin-flowtype": "^2.36.0",
     "eslint-plugin-react": "^7.4.0",
     "eslint-plugin-react-native": "^3.1.0",
-    "flow-bin": "^0.55.0",
+    "flow-bin": "^0.57.3",
     "jest": "^21.2.0",
     "prettier": "^1.7.0",
     "prettier-eslint": "^8.2.1",