Suppress dirty identifier (#60)

Suppress dirty identifier in versionName due to submodules getting dirty during build process

Author: vlussenburg

backtrace-library/build.gradle

@@ -3,6 +3,12 @@ plugins {
 }
 apply plugin: 'com.android.library'
 
+androidGitVersion {
+    // this is responsible for 
+    // default is %tag%%-count%%-commit%%-branch%%-dirty% - removed %-dirty% because submodules tend to get dirty
+    format '%tag%%-count%%-commit%%-branch%'
+}
+
 android {
 
     compileSdkVersion 30