Update README.md

Author: rodriigovieira

README.md

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   <img src="https://user-images.githubusercontent.com/7014073/98849326-cca07f80-2431-11eb-82dd-fd2b4e52be44.png?s=300" width="500" /><br/>
   React Native Navigation Drawer Extension
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+</h2>
 
 <p>
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