testflight method will yield object if given the block

We could configure for testflight with block parameter. like:

    app.testflight do |flight|
      flight.sdk = 'vendor/TestFlight'
      flight.api_token = '<insert your API token here>'
      flight.team_token = '<insert your team token here>'
      flight.notify = true # default is false
    end

lib/motion/project/testflight.rb

@@ -82,7 +82,7 @@ module Motion; module Project; class Config
 
   def testflight
     @testflight ||= TestFlightConfig.new(self)
-    yield if block_given? && testflight?
+    yield @testflight if block_given? && testflight?
     @testflight
   end