Add watchOS and tvOS support.

Author: wolfcon

MJExtension.podspec

@@ -1,8 +1,10 @@
 Pod::Spec.new do |s|
   s.name         = "MJExtension"
-  s.version      = "3.2.5"
+  s.version      = "3.3.0"
   s.ios.deployment_target = '9.0'
   s.osx.deployment_target = '10.8'
+  s.tvos.deployment_target = '9.0'
+  s.watchos.deployment_target = '2.0'
   s.summary      = "A fast and convenient conversion between JSON and model"
   s.homepage     = "https://github.com/CoderMJLee/MJExtension"
   s.license      = "MIT"