update pod ver

Author: longbai

Qiniu.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'Qiniu'
-  s.version      = '8.2.1'
+  s.version      = '8.3.0'
   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'