Add basic travis tests

Author: JelteF

.travis.yml

@@ -0,0 +1,8 @@
+language: node_js
+node_js:
+  - 9
+  - 8
+script:
+  - yarn lint
+  - yarn flow
+  - yarn docs

README.md

@@ -1,5 +1,8 @@
 # Stream React Native Activity Feed Components
 
+[![NPM](https://img.shields.io/npm/v/react-native-activity-feed.svg)](https://www.npmjs.com/package/react-native-activity-feed)
+[![Build Status](https://travis-ci.org/GetStream/react-native-activity-feed.svg?branch=master)](https://travis-ci.org/GetStream/react-native-activity-feed)
+
 ![react native activity feed](./src/images/githubhero.png)
 
 The official React Native integration library for Stream, a web service for building scalable newsfeeds and activity streams.