Update version to follow official pod

Author: Stewart Wu

YangMingShan.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name         = 'YangMingShan'
-  s.author       = { "Team" => "yang-ming-shan@yahoo-inc.com" }
-  s.version      = '1.3.0'
+  s.author       = { "Team" => "yang-ming-shan@oath.com" }
+  s.version      = '2.0.0'
   s.summary      = 'The collection of useful UI components that inspired by Yahoo apps.'
   s.homepage     = 'https://github.com/yahoo/YangMingShan'
   s.license      = "Yahoo! Inc. BSD license"