Add tvOS support to Podspec

ReactNativePermissions.podspec

   s.authors         = package["author"]
   s.homepage        = package["homepage"]
 
-  s.platform        = :ios, "9.0"
+  s.platforms       = { :ios => "9.0", :tvos => "11.0" }
   s.requires_arc    = true
 
   s.source          = { :git => package["repository"]["url"], :tag => s.version }