Adds tvOS support to podspec

Author: Tuomas Artman

Geometry.podspec

@@ -9,6 +9,7 @@ Pod::Spec.new do |s|
   s.source = { :git => 'https://github.com/artman/Geometry.git', :tag => s.version }
 
   s.ios.deployment_target = '8.0'
+  s.tvos.deployment_target = '9.0'
 
   s.source_files = 'Geometry/*.swift'