Added Build status badge.

Author: kirankalyan5

README.md

@@ -1,5 +1,6 @@
 # react-native-segmented-control-tab(for Android/iOS) 🚀
 [![npm](https://img.shields.io/npm/v/react-native-segmented-control-tab.svg?style=flat-square "npm version")](https://www.npmjs.com/package/react-native-segmented-control-tab)
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