Update README.md

Author: charpeni

README.md

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 React Native SegmentedControlIOS library. Use SegmentedControlIOS to render a UISegmentedControl iOS.
 
-<img src="https://github.com/react-native-community/react-native-segmented-control/blob/master/ScreenShots/Screen%20Shot%202019-02-26%20at%206.28.55%20PM.png" height="400" />
+<img src="https://github.com/react-native-community/react-native-segmented-control/blob/master/ScreenShots/Screen%20Shot%202019-02-26%20at%206.28.55%20PM.png" height="500" />
 
 ## Getting started
 Install the library using either Yarn: