Changes from 0.3 to 0.4
-----------------------

* A new, strict UTF-8 decoder
* Minor bugs fixed in UTF-16 and BootString
* Test cases for UTF-8, UTF-16 and BootString
* Added KOI8U encoding

Changes from 0.2 to 0.3
-----------------------

* Converted to new cabal interface
* Support for GHC 6.8
* Support for new bytestring interface

Changes from 0.1 to 0.2
-----------------------

* Implemented GB18030 encoding
