Add in UPGRADE.md about config file change (AdminBundle)
Add in UPGRADE.md about config file change (AdminBundle)

psren/Sylius,itinance/Sylius,bretto36/Sylius,gmoigneu/platformsh-integrations,lchrusciel/Sylius,gorkalaucirica/Sylius,vihuvac/Sylius,ktzouno/Sylius,Arminek/Sylius,itinance/Sylius,danut007ro/Sylius,gabiudrescu/Sylius,foobarflies/Sylius,MichaelKubovic/Sylius,ezecosystem/Sylius,NeverResponse/Sylius,bitbager/Sylius,antonioperic/Sylius,gabiudrescu/Sylius,venyii/Sylius,Joypricecorp/Sylius,Mozan/Sylius,DorianCMore/Sylius,itinance/Sylius,diimpp/Sylius,pjedrzejewski/Sylius,pjedrzejewski/Sylius,antonioperic/Sylius,mheki/Sylius,videni/Sylius,psren/Sylius,Zales0123/Sylius,DorianCMore/Sylius,danut007ro/Sylius,mkilmanas/Sylius,loic425/Sylius,mbabker/Sylius,cdaguerre/Sylius,Joypricecorp/Sylius,danut007ro/Sylius,Mozan/Sylius,inssein/Sylius,Pitoune/Sylius,ylastapis/Sylius,TheMadeleine/Sylius,CoderMaggie/Sylius,mheki/Sylius,ezecosystem/Sylius,Brille24/Sylius,dragosprotung/Sylius,diimpp/Sylius,Mozan/Sylius,bretto36/Sylius,Pitoune/Sylius,gorkalaucirica/Sylius,pamil/Sylius,ktzouno/Sylius,mheki/Sylius,mbabker/Sylius,torinaki/Sylius,mbabker/Sylius,pjedrzejewski/Sylius,MichaelKubovic/Sylius,CoderMaggie/Sylius,ezecosystem/Sylius,Zales0123/Sylius,Brille24/Sylius,NeverResponse/Sylius,pjedrzejewski/Sylius,dragosprotung/Sylius,foobarflies/Sylius,GSadee/Sylius,regnisolbap/Sylius,bitbager/Sylius,loic425/Sylius,diimpp/Sylius,Niiko/Sylius,danut007ro/Sylius,inssein/Sylius,gabiudrescu/Sylius,Mozan/Sylius,Niiko/Sylius,vihuvac/Sylius,kayue/Sylius,101medialab/Sylius,venyii/Sylius,CoderMaggie/Sylius,DorianCMore/Sylius,regnisolbap/Sylius,bretto36/Sylius,Arminek/Sylius,SyliusBot/Sylius,gseidel/Sylius,Zales0123/Sylius,bitbager/Sylius,gruberro/Sylius,gorkalaucirica/Sylius,mbabker/Sylius,CoderMaggie/Sylius,gmoigneu/platformsh-integrations,pamil/Sylius,ktzouno/Sylius,ktzouno/Sylius,gruberro/Sylius,SyliusBot/Sylius,loic425/Sylius,Sylius/Sylius,Niiko/Sylius,psren/Sylius,101medialab/Sylius,TheMadeleine/Sylius,Brille24/Sylius,gseidel/Sylius,NeverResponse/Sylius,dragosprotung/Sylius,kayue/Sylius,antonioperic/Sylius,101medialab/Sylius,regnisolbap/Sylius,foobarflies/Sylius,torinaki/Sylius,torinaki/Sylius,mkilmanas/Sylius,vihuvac/Sylius,MichaelKubovic/Sylius,Sylius/Sylius,gmoigneu/platformsh-integrations,TheMadeleine/Sylius,lchrusciel/Sylius,Sylius/Sylius,GSadee/Sylius,kayue/Sylius,gmoigneu/platformsh-integrations,bitbager/Sylius,Pitoune/Sylius,Joypricecorp/Sylius,Niiko/Sylius,Joypricecorp/Sylius,Brille24/Sylius,mkilmanas/Sylius,psren/Sylius,Mozan/Sylius,itinance/Sylius,Pitoune/Sylius,NeverResponse/Sylius,gseidel/Sylius,venyii/Sylius,Arminek/Sylius,cdaguerre/Sylius,pamil/Sylius,ylastapis/Sylius,cdaguerre/Sylius,torinaki/Sylius,ylastapis/Sylius,inssein/Sylius,mheki/Sylius,ezecosystem/Sylius,venyii/Sylius,gruberro/Sylius,gorkalaucirica/Sylius,videni/Sylius,foobarflies/Sylius,gseidel/Sylius,lchrusciel/Sylius,MichaelKubovic/Sylius,gabiudrescu/Sylius,videni/Sylius,mkilmanas/Sylius,SyliusBot/Sylius,inssein/Sylius,cdaguerre/Sylius,vihuvac/Sylius,dragosprotung/Sylius,cdaguerre/Sylius,GSadee/Sylius,DorianCMore/Sylius,TheMadeleine/Sylius,regnisolbap/Sylius,bretto36/Sylius,gruberro/Sylius,videni/Sylius,ylastapis/Sylius