Fix fastlane warning

fastlane/actions/sync_build_number_to_git.rb

@@ -1,7 +1,7 @@
 module Fastlane
   module Actions
     module SharedValues
-      BUILD_NUMBER = :BUILD_NUMBER
+      KF_BUILD_NUMBER = :BUILD_NUMBER
     end
     class SyncBuildNumberToGitAction < Action
       def self.is_git?
@@ -19,12 +19,12 @@ module Fastlane
         end
       build_number = (Actions.sh command).strip
       Fastlane::Actions::IncrementBuildNumberAction.run(build_number: build_number)
-      Actions.lane_context[SharedValues::BUILD_NUMBER] = build_number
+      Actions.lane_context[SharedValues::KF_BUILD_NUMBER] = build_number
       end
 
       def self.output
         [
-          ['BUILD_NUMBER', 'The new build number']
+          ['KF_BUILD_NUMBER', 'The new build number']
         ]
       end
       #####################################################