Create CHANGELOG.md

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+`Default` adheres to [Semantic Versioning](http://semver.org/).
+
+--- 
+
+## [2.0.0](https://github.com/Nirma/Default/releases/tag/2.0.0) (11/20/2017)
+
+#### Summary
+The release's focus is about shortening the read / write method names and adding support for having a default
+value for when the value being read is currently not stored in the users defaults.
+
+## Changes
+- Writing an object to `UserDefaults` with Default is now accomplished with: `write()` or `write(withKey:)`
+- Reading an object from `UserDefaults` is now accomplished with `read()` or `read(forKey:)`
+- `defaultValue` has been added to the protocol, the default implementation returns `nil` can be customized
+to return a default value when nothing exists in defaults.
+
+## [1.0.0](https://github.com/Nirma/Default/releases/tag/1.0.0) (10/19/2017)
+
+#### Summary
+This is the first release of this library!
+Please see the README to learn more!
+