minimum Android/SDK version

Has there been some discussion documented somewhere about the minimum SDK level that we want to support?

In order to use the more secure v2 APK signatures, we would need to increase the minimum SDK level to at least 24 (Android 7). At the moment, we have minSdk 21 set in the build.gradle, which is Android 5.0.

Additionally, moving to 24 would allow us to get away from MD5 and SHA-1 signatures on the apk itself.