Update README.md

Author: TutorialsAndroid

README.md

@@ -8,7 +8,7 @@ This library allows launching a crash activity when the app crashes, instead of
 
 **Sample Screen**
 
-![](https://github.com/TutorialsAndroid/crashx/blob/master/images/device-2019-03-19-154405.jpg)
+![](https://github.com/TutorialsAndroid/crashx/blob/master/images/device-2019-03-19-154405.png)
 
 ## How to use