Fix podspec syntax

TwitterCore.podspec

@@ -6,7 +6,7 @@ Pod::Spec.new do |s|
   s.documentation_url = "https://github.com/twitter/twitter-kit-ios/wiki"
   s.social_media_url = "https://twitter.com/TwitterDev"
   s.authors = "Twitter"
-  s.platforms = { :ios => "11.0", :tvos => 11.0" }
+  s.platforms = { :ios => "11.0", :tvos => "11.0" }
   s.source = { :http => "https://github.com/abema/twitter-kit-ios/releases/download/#{s.version}/#{s.name}.xcframework.zip" }
   s.vendored_frameworks = "#{s.name}.xcframework"
   s.license = { :type => "Commercial", :text => "Copyright Twitter, Inc. All Rights Reserved. Use of this software is subject to the terms and conditions of the Twitter Kit Agreement located at https://dev.twitter.com/overview/terms/twitterkit and the Developer Agreement located at https://dev.twitter.com/overview/terms/agreement. OSS: https://github.com/twitter/twitter-kit-ios/blob/master/OS_LICENSES.md" }