Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -3,6 +3,7 @@ Contributing
 
 ## Reporting issues
 
+* IMPORTANT: Any issues reported regarding the old Play Store version of the original GitHub app will be closed without investigation. Please only report issues regarding the current repo version (i.e. you must confirm this issue exists in the latest master). This is a different app now, and many old issues with the original app (such as 2FA) were resolved in master but not released.
 * Make sure there's not already an issue (open or closed) regarding your issue.
 * Include detailed information and steps to reproduce. Any issues opened with no description will be ignored.
 * Include a screenshot(s) of the issue. Brownie points for a screen recording of the issue.
@@ -32,4 +33,4 @@ you're working on it.
 
 Please make sure you discuss these with us in the issue tracker before opening a pull request. It's good to get a conversation
 going first to make sure that everyone is on the same page, and this way you don't accidentally invest a lot of time into
-something we don't want to merge. That said, we're always open to these, so please don't hesitate to start the discussion!
+something we don't want to merge. That said, we're always open to these, so please don't hesitate to start the discussion!