Update CONTRIBUTING.md

no dev version, built from master

CONTRIBUTING.md

@@ -204,6 +204,6 @@ Release Candidate releases are based on the git [master](https://github.com/next
 
 
 ### Dev Release
-Dev releases are based on the [dev](https://github.com/nextcloud/android/tree/dev) branch and are done independently from stable releases and integrate open PRs that might not be production ready or heavily tested but being put out there for people willing to test new features and provide valuable feedback on new features to be incorporated before a feature gets released in the stable app.
+Dev releases are based on the [master](https://github.com/nextcloud/android/tree/master) branch and are done independently from stable releases for people willing to test new features and provide valuable feedback on new features to be incorporated before a feature gets released in the stable app.
 
 The deployment/build is done once a day automatically. If code has changed a new apk will be published [here](https://download.nextcloud.com/android/dev) and it will, with a little delay, be available on [Fdroid](https://f-droid.org/repository/browse/?fdfilter=nextcloud&fdid=com.nextcloud.android.beta).