added a CHANGELOG
added a CHANGELOG

fabpot/Pimple,silexphp/Pimple,mcuadros/pimple-hack,jbboehr/Pimple,arduanov/Pimple,fabpot/Pimple,RustJason/Pimple,jbboehr/Pimple,Ocramius/Pimple,RustJason/Pimple,jpauli/Pimple,gomboc/Pimple,jpauli/Pimple,jpauli/Pimple,michabbb-backup/Pimple,gomboc/Pimple,arduanov/Pimple,mnapoli/simplex