Merge pull request #993 from RocketChat/chore/increment_build_beta1

[CHORE] Increment version to beta1 & 2001

app/build.gradle

@@ -13,8 +13,8 @@ android {
         applicationId "chat.rocket.android"
         minSdkVersion 21
         targetSdkVersion versions.targetSdk
-        versionCode 2000
-        versionName "2.0.0-alpha1"
+        versionCode 2001
+        versionName "2.0.0-beta1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
     }