Increase minimum version for watchOS

Author: fassko

NSObject+Rx.podspec

@@ -12,7 +12,7 @@ Pod::Spec.new do |s|
 
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.10'
-  s.watchos.deployment_target = '2.0'
+  s.watchos.deployment_target = '3.0'
   s.tvos.deployment_target = '9.0'
 
   s.swift_version = '5.0'