ADD: bump version to 2.0.0, release YTKNetwork 2.0

Change-Id: If7189fac1775be7b172c9d484fa04b7572fdfe19

YTKNetwork.podspec

@@ -1,14 +1,15 @@
 Pod::Spec.new do |s|
 
   s.name         = "YTKNetwork"
-  s.version      = "1.3.0"
+  s.version      = "2.0.0"
   s.summary      = "YTKNetwork is a high level request util based on AFNetworking."
   s.homepage     = "https://github.com/yuantiku/YTKNetwork"
   s.license      = "MIT"
   s.author             = {
                           "tangqiao" => "[email protected]",
                           "lancy" => "[email protected]",
-                          "maojj" => "[email protected]"
+                          "maojj" => "[email protected]",
+                          "liujl" => "[email protected]"
  }
   s.source        = { :git => "https://github.com/yuantiku/YTKNetwork.git", :tag => s.version.to_s }
   s.source_files  = "YTKNetwork/*.{h,m}"