Update podspec

SwiftRater.podspec

@@ -10,6 +10,7 @@ Pod::Spec.new do |s|
   s.name             = 'SwiftRater'
   s.version          = '2.1.0'
   s.summary          = 'A utility that reminds your iPhone app users to review the app written in pure Swift.'
+  s.platform = :ios, '11.0'
 
 # This description is used to generate tags and improve search results.
 #   * Think: What does it do? Why did you write it? What is the focus?
@@ -29,9 +30,6 @@ SwiftRater is a class that you can drop into any iPhone app that will help remin
   s.social_media_url = 'https://twitter.com/takecian'
   s.swift_versions    = ['5.0', '5.1']
 
-  s.ios.deployment_target = '11.0'
-  s.osx.deployment_target = '10.10'
-
   s.source_files = 'SwiftRater/**/*'
   s.exclude_files = 'SwiftRater/**/*.{plist}'
 end