更新pod spec文件

 Pod::Spec.new do |s|
   s.name             = "YHExplorer"
-  s.version          = "1.0.1"
+  s.version          = "1.0.3"
   s.summary          = "Integrated WebView with Cordova"
   s.description      = <<-DESC
                        An WebView Kit integrated Cordova.
@@ -45,6 +45,10 @@ Pod::Spec.new do |s|
   ss.source_files = 'YHExplorer/YHLinkParser/*.{h,m}'
   end
 
+  s.subspec 'UINavigation+Pop' do |ss|
+  ss.source_files = 'YHExplorer/UINavigation+Pop/*.{h,m}'
+  end
+
   s.frameworks = 'Foundation', 'CoreGraphics', 'UIKit'
 
 end