[Changelog] Add entry for CocoaPods#166

CHANGELOG.md

@@ -1,5 +1,44 @@
 # Xcodeproj Changelog
 
+## 0.21.0
+
+###### Breaking
+
+* `Constants` The build settings match now those from Xcode 6.1.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [Kyle Fuller](https://github.com/kylef)
+  [Xcodeproj#166](https://github.com/CocoaPods/Xcodeproj/pull/166)
+
+
+###### Enhancements
+
+* `ProjectHelper` The `::common_build_settings` method supports now a new
+  parameter `language` to select the language used in the target. Acceptable
+  options are either `:objc` or `:swift`.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [Xcodeproj#166](https://github.com/CocoaPods/Xcodeproj/pull/166)
+
+* `ProjectHelper` Supports to create framework targets for iOS & OSX with the
+  correct build settings.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [Xcodeproj#166](https://github.com/CocoaPods/Xcodeproj/pull/164)
+
+* `Commands` Xcodeproj CLI has a new command `config-dump`, which allows to
+  read the build settings from all configurations of all targets of a given
+  Xcode project and serialize them to .xcconfig files.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [Xcodeproj#166](https://github.com/CocoaPods/Xcodeproj/pull/166)
+
+
+###### Development Enhancements
+
+* `Rakefile` Brings a set of new tasks to interactively generate fixture targets
+  for all target configurations supported by Xcode to update the xcconfig
+  fixtures used for the new specs, which check the build settings constants.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [Xcodeproj#166](https://github.com/CocoaPods/Xcodeproj/pull/166)
+
+
 ## 0.20.2
 
 ##### Bug Fixes