Generate changelog for v1.6.8
Generate changelog for v1.6.8

mbabker/Sylius,loic425/Sylius,SyliusBot/Sylius,Sylius/Sylius,diimpp/Sylius,101medialab/Sylius,loic425/Sylius,antonioperic/Sylius,mbabker/Sylius,mbabker/Sylius,GSadee/Sylius,kayue/Sylius,pamil/Sylius,antonioperic/Sylius,Zales0123/Sylius,lchrusciel/Sylius,kayue/Sylius,pamil/Sylius,101medialab/Sylius,101medialab/Sylius,pjedrzejewski/Sylius,Sylius/Sylius,mbabker/Sylius,kayue/Sylius,Sylius/Sylius,Zales0123/Sylius,Arminek/Sylius,pjedrzejewski/Sylius,diimpp/Sylius,Arminek/Sylius,antonioperic/Sylius,diimpp/Sylius,lchrusciel/Sylius,Zales0123/Sylius,pjedrzejewski/Sylius,loic425/Sylius,pjedrzejewski/Sylius,lchrusciel/Sylius,Arminek/Sylius,GSadee/Sylius,GSadee/Sylius,SyliusBot/Sylius,pamil/Sylius,SyliusBot/Sylius