Add changes in UPGRADE-1.8.md
Add changes in UPGRADE-1.8.md

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