Add change log

CHANGES.md

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+### v1.2.0
+2013-05-27
+**Warning** Some of the changes in this update will break backward compatibility.
+- Remove constructor from Handler.
+- Add Interfaces: RouterInterface, RouteInterface, HandlerInterface, RequestInterface, and ResponseInterface
+- Classes are updated to implement interfaces and type hint interfaces in method calls. For example, Router now implements RouteInterface and its method addRoute() now type hints the parameter as a RouteInterface instead of a Route.
+- Route fields pattern and handler are now private and replaced accessors to conform to RouteInterface
+- Add support for port in Request. You can now use Request::setPort() and Request::getPort(), and the port is included and extract from the URI.
+
+### v1.1.2
+2013-05-19
+- Change Handler to an abstract class
+- Add Handler::respondWithMethodNotAllowed() for flexibility
+- Convert a number of methods from protected to private
+- Bug fix: return null or false from magic __get() and __isset() methods
+
+### v1.1.1
+2013-03-29
+- Bug fix: Instantiate Message->headers and Message->headerLines in constructor
+
+### v1.1.0
+2013-03-26
+- Add MIT License to composer.json
+- Add constructor to Request to allow setting URI and method on instantiation
+- Add Response::getSuccess()