README: fix file extension

Author: prototype74

README.md

@@ -7,7 +7,7 @@ Additionally it displays some more or less important information such as the
 current CSC, front cam type and more.
 
 ## Screenshots
-<img src="images/app_main_general.jpg" width="360" height="640" /> <img src="images/app_main_camera.jpg" width="360" height="640" /> <img src="images/app_main_camera2.png" width="360" height="640" />
+<img src="images/app_main_general.jpg" width="360" height="640" /> <img src="images/app_main_camera.jpg" width="360" height="640" /> <img src="images/app_main_camera2.jpg" width="360" height="640" />
 
 ## Download
 Check out the [release section](https://github.com/prototype74/NeoInfo/releases) to get the latest APK