[SourcesManager] Link directly to GH release for new version message

lib/cocoapods/sources_manager.rb

@@ -373,14 +373,15 @@ module Pod
           install_message << 'gem install cocoapods'
           install_message << ' --pre' if rc
           message = [
-            "CocoaPods #{versions['last']} is available.".green,
+            "CocoaPods #{last} is available.".green,
             "To update use: `#{install_message}`".green,
             ("[!] This is a test version we'd love you to try.".yellow if rc),
             ("Until we reach version 1.0 the features of CocoaPods can and will change.\n" \
              'We strongly recommend that you use the latest version at all times.'.yellow unless rc),
             '',
-            'For more information see https://blog.cocoapods.org'.green,
-            'and the CHANGELOG for this version http://git.io/BaH8pQ.'.green,
+            'For more information, see https://blog.cocoapods.org ' \
+            'and the CHANGELOG for this version at ' \
+            "https://github.com/CocoaPods/CocoaPods/releases/tag/#{last}".green,
             '',
           ].compact.join("\n")
           UI.puts("\n#{message}\n")