Update README.md

Author: Mohamed-Abbas

README.md

@@ -1,6 +1,6 @@
 # react-native-universal-datepicker-ios.
 
-## Installing.
+## Installation.
    [![NPM](https://nodei.co/npm/react-native-hijri-date-picker-android.png?downloads=true&downloadRank=true&stars=true)](https://nodei.co/npm/react-native-hijri-date-picker-android/)
 
 $ npm install react-native-hijri-date-picker-android --save