Update build.gradle

Author: Aries Hoo²⁰¹⁹

build.gradle

@@ -30,5 +30,5 @@ ext{
     targetSdkVersion = 28
     supportVersion = "1.0.0"
     versionCode = 240
-    versionName = "2.2.13_beta6"
+    versionName = "2.2.13_beta8"
 }