update pod file v4.4

XHRefreshControl.podspec

@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name         = "XHRefreshControl"
-  s.version      = "4.3"
+  s.version      = "4.4"
   s.summary      = "XHRefreshControl 是一款高扩展性、低耦合度的下拉刷新、上提加载更多的组件。"
   s.homepage     = "https://github.com/xhzengAIB/XHRefreshControl"
   s.license      = "MIT"
   s.authors      = { "xhzengAIB" => "[email protected]" }
-  s.source       = { :git => "https://github.com/xhzengAIB/XHRefreshControl.git", :tag => "v4.3" }
+  s.source       = { :git => "https://github.com/xhzengAIB/XHRefreshControl.git", :tag => "v4.4" }
   s.frameworks   = 'Foundation', 'CoreGraphics', 'UIKit'
   s.platform     = :ios, '5.0'
   s.source_files = 'RefreshControl/**/**/*.{h,m}'