Update README.md

Remove screenshot

Author: CoderJava

README.md

@@ -79,6 +79,3 @@ A mock framework inspired by Mockito.
 A testing library which makes it easy to test blocs.
 17. JSON Serializable<br />
 Automatically generate code for converting to and from JSON by annotating Dart classes.
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-![News App](https://github.com/CoderJava/Flutter-News-App/blob/master/screenshots/output_app_v2.png)