Bump version to 3.0.4-b6

Author: niranjan94

app/build.gradle

@@ -28,7 +28,7 @@ apply plugin: "ru.tinkoff.gradle.jarjar"
 def versionMajor = 3
 def versionMinor = 0
 def versionPatch = 4
-def versionBuild = 5
+def versionBuild = 6
 
 def getGitHash = { ->
     def stdout = new ByteArrayOutputStream()