Podspec did not match repo's tag naming (#3650)

ReactNativeNavigation.podspec

 
   s.module_name  = 'ReactNativeNavigation'
 
-  s.source       = { :git => "https://github.com/wix/react-native-navigation.git", :tag => "v#{s.version}" }
+  s.source       = { :git => "https://github.com/wix/react-native-navigation.git", :tag => "#{s.version}" }
   s.source_files  = "lib/ios/**/*.{h,m}"
   s.exclude_files  = "lib/ios/ReactNativeNavigationTests/**/*.*"