Updated changelog with new norms
Changes since the last release
------------------------------
+* Changed 2-norms to inf-norms
* Fixed code generation bug when scaling is disabled [#7](https://github.com/oxfordcontrol/osqp/issues/7)
* Removed warnings in code-generation for standard <= C99
* Fixed MATLAB 2015b compatibility [#6](https://github.com/oxfordcontrol/osqp/issues/6)
