Update README.md

Author: alvaromb

README.md

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 # react-native-keyboard-aware-scroll-view
 
 <img src="https://travis-ci.org/APSL/react-native-keyboard-aware-scroll-view.svg?branch=master" />
+<img src="https://img.shields.io/npm/dm/react-native-keyboard-aware-scroll-view.svg" />
 
 A ScrollView component that handles keyboard appearance and automatically scrolls to focused `TextInput`.