Android Studio wants to ignore gradle.properties, so store release properties...

Android Studio wants to ignore gradle.properties, so store release properties in release.properties.

app/build.gradle

@@ -146,6 +146,7 @@ release {
     buildTasks = ['build']
     beforeReleaseBuild.dependsOn 'clean'
     afterReleaseBuild.dependsOn 'signRelease', 'zipalignRelease'
+    versionPropertyFile = 'release.properties'
 }
 
 dependencies {

app/gradle.properties

-version=0.5.0-SNAPSHOT

app/release.properties

+version=0.5.0