Wrote CHANGELOG for the 0.12.0 release.
Wrote CHANGELOG for the 0.12.0 release.

localheinz/zend-diactoros,Maks3w/zend-diactoros,Ocramius/zend-diactoros,mtymek/zend-diactoros,mnapoli/zend-diactoros,deepfreeze/zend-diactoros,jguittard/zend-diactoros