prep for release of version 2.8.0 (build 51)

Author: ncosgray

…metadata/android/en-US/changelogs/50.txt …metadata/android/en-US/changelogs/51.txtfastlane/metadata/android/en-US/changelogs/50.txt renamed to fastlane/metadata/android/en-US/changelogs/51.txt fastlane/metadata/android/en-US/changelogs/50.txt renamed to fastlane/metadata/android/en-US/changelogs/51.txt

@@ -15,7 +15,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 2.8.0+50
+version: 2.8.0+51
 
 environment:
   sdk: '>=3.4.0 <4.0.0'