message: travis badge added
diff: # NativeBase v0.5.20
  +
  +[![Build Status](https://travis-ci.org/GeekyAnts/NativeBase.svg?branch=master)](https://travis-ci.org/GeekyAnts/NativeBase)
  +
  Essential cross-platform UI components for React Native
  ![Demo](https://github.com/GeekyAnts/NativeBase-KitchenSink/raw/master/Screenshots/iOS/demo.gif)
  