适配xcode13

BFFramework.podspec

@@ -28,7 +28,7 @@ TODO: Add long description of the pod here.
   s.source           = { :git => 'https://git.yishihui.com/iOS/BFFramework.git'}
   # s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
 
-  s.ios.deployment_target = '10.0'
+  s.ios.deployment_target = '12.0'
 
   s.source_files = 'BFFramework/Classes/**/*'