don't rely on git commands in github context for previous_sha (#31)

Author: NicoHinderling

lib/fastlane/plugin/emerge/helper/github.rb

@@ -42,11 +42,6 @@ def self.base_sha
       def self.previous_sha
         if is_push?
           github_event_data.dig(:before)
-        else
-          shell_command = "git rev-parse HEAD^"
-          UI.command(shell_command)
-          stdout, _, status = Open3.capture3(shell_command)
-          stdout.strip if status.success?
         end
       end
 

lib/fastlane/plugin/emerge/version.rb

@@ -1,5 +1,5 @@
 module Fastlane
   module Emerge
-    VERSION = "0.10.5"
+    VERSION = "0.10.6"
   end
 end