updated pod spec to allow tvos (#69)

* updated pod spec to allow tvos

* Update podspec

Author: kajensen

ParseLiveQuery.podspec

@@ -10,7 +10,10 @@ Pod::Spec.new do |s|
 
   s.requires_arc = true
 
+  s.platform = :ios, :osx, :tvos
+
   s.ios.deployment_target = '8.0'
+  s.tvos.deployment_target = '9.0'
   s.osx.deployment_target = '10.10'
 
   s.source_files = 'Sources/ParseLiveQuery/**/*.swift'