Add tvOS deployment target to podspec (#75)

* Add tvOS deployment target to podspec

* Remove unnecessary platform specifier from Podspec

Co-authored-by: mcnabbk <[email protected]>

Author: daltonclaybrook

Segment-Amplitude.podspec

@@ -16,10 +16,13 @@ Pod::Spec.new do |s|
   s.source           = { :git => "https://github.com/segment-integrations/analytics-ios-integration-amplitude.git", :tag => s.version.to_s }
   s.social_media_url = 'https://twitter.com/segment'
 
-  s.platform     = :ios, '10.0'
+  s.ios.deployment_target = '10.0'
+  s.tvos.deployment_target = '9.0'
+  
   s.requires_arc = true
 
   s.static_framework = true
+
   s.source_files = 'Pod/Classes/**/*'
 
   s.dependency 'Analytics'