Merge pull request #358 from firebase/update-version

Update version to 0.9.0.pre.2

Author: rebehe

lib/fastlane/plugin/firebase_app_distribution/version.rb

@@ -1,5 +1,5 @@
 module Fastlane
   module FirebaseAppDistribution
-    VERSION = "0.9.0.pre.1"
+    VERSION = "0.9.0.pre.2"
   end
 end