Update CONTRIBUTING.md

Author: nickbutcher

Diff for: CONTRIBUTING.md

@@ -30,4 +30,4 @@ All development is done on the latest `dev_XX` branch. You should base any chang
    [Kotlin Style Guide](https://android.github.io/kotlin-guides/style.html) for the
    recommended coding standards for this organization.
 1. Ensure that your code has an appropriate set of unit tests which all pass.
-1. Submit a pull request targeting the `develop` branch.
+1. Submit a pull request targeting the latest `dev_XX` branch.