Updating deployment target

Author: Tom Baranes

Diff.podspec

@@ -12,7 +12,7 @@ This library generates differences between any two Collections (and Strings). It
   s.author             = { "Wojtek Czekalski" => "[email protected]" }
   s.social_media_url   = "https://twitter.com/wokalski"
 
-  s.platforms = { :ios => "9.0", :osx => "10.11", :tvos => "10.0", :watchos => "3.0" }
+  s.platforms = { :ios => "8.0", :osx => "10.10", :tvos => "9.0", :watchos => "3.0" }
   s.osx.exclude_files = "Sources/Diff+UIKit.swift"
   s.watchos.exclude_files = "Sources/Diff+UIKit.swift"