Add date to changes file

Author: Riimu

CHANGES.md

@@ -1,6 +1,6 @@
 # Changelog #
 
-## v2.0.0 (?) ##
+## v2.0.0 (2014-12-29) ##
 
   * Encoding is now separated into external encoding classes
   * Various options are now set via PHPEncoder::setOption() instead

README.md

@@ -81,7 +81,7 @@ This would create the following output:
 
 Of course, the most important feature of this library is the ability to
 customize the created the PHP code. As the second argument, the `encode()`
-method takes an array of options, which can be used to customise the returned
+method takes an array of options, which can be used to customize the returned
 PHP code. For example:
 
 ```php