minor num publish for pod error

Author: longbai

Qiniu.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'Qiniu'
-  s.version      = "7.0.19"
+  s.version      = "7.0.19.1"
   s.summary      = "Qiniu Resource Storage SDK for iOS and Mac"
   s.homepage     = "https://github.com/qiniu/objc-sdk"
   s.social_media_url = "http://weibo.com/qiniutek"