Update README.md

Author: RichardLindhout

README.md

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 ## react-native-paper-dates
 
-- Smooth and fast cross platform date picker for React Native Paper
+- Smooth and fast cross platform Material Design date picker for React Native Paper
 - Tested on Android, iOS and the web platform!
 - Uses the native Date.Intl API's which work out of the box on the web / iOS
 - Simple API