Update UPGRADE.md
Update UPGRADE.md

today I have asked our developers to analyze the effort required to upgrade our version of Sylius to 1.0 and I realized that the removal of SyliusWebBundle is not included in the UPGRADE.md file.

I don't know if what I have proposed is the best description, but feel free to come up with new ideas.
pamil/Sylius,Rvanlaak/Sylius,nakashu/Sylius,gorkalaucirica/Sylius,itinance/Sylius,gruberro/Sylius,sweoggy/Sylius,SyliusBot/Sylius,foobarflies/Sylius,jjanvier/Sylius,bretto36/Sylius,CoderMaggie/Sylius,Zales0123/Sylius,michalmarcinkowski/Sylius,cdaguerre/Sylius,ReissClothing/Sylius,Ejobs/Sylius,michalmarcinkowski/Sylius,regnisolbap/Sylius,gabiudrescu/Sylius,antonioperic/Sylius,vihuvac/Sylius,Ejobs/Sylius,MichaelKubovic/Sylius,SyliusBot/Sylius,MichaelKubovic/Sylius,ReissClothing/Sylius,jvahldick/Sylius,ezecosystem/Sylius,ylastapis/Sylius,antonioperic/Sylius,foobarflies/Sylius,gabiudrescu/Sylius,kayue/Sylius,okwinza/Sylius,Ejobs/Sylius,okwinza/Sylius,ylastapis/Sylius,psren/Sylius,videni/Sylius,diimpp/Sylius,101medialab/Sylius,coudenysj/Sylius,Brille24/Sylius,okwinza/Sylius,Mozan/Sylius,bitbager/Sylius,psren/Sylius,dragosprotung/Sylius,steffenbrem/Sylius,mbabker/Sylius,Mozan/Sylius,Joypricecorp/Sylius,Zales0123/Sylius,gruberro/Sylius,Pitoune/Sylius,coudenysj/Sylius,SyliusBot/Sylius,ezecosystem/Sylius,patrick-mcdougle/Sylius,mkilmanas/Sylius,mheki/Sylius,Arminek/Sylius,Mozan/Sylius,CoderMaggie/Sylius,coudenysj/Sylius,Lowlo/Sylius,foobarflies/Sylius,antonioperic/Sylius,bitbager/Sylius,regnisolbap/Sylius,cdaguerre/Sylius,bretto36/Sylius,dragosprotung/Sylius,diimpp/Sylius,Arminek/Sylius,ylastapis/Sylius,ktzouno/Sylius,TheMadeleine/Sylius,bretto36/Sylius,sweoggy/Sylius,Niiko/Sylius,bitbager/Sylius,foobarflies/Sylius,inssein/Sylius,regnisolbap/Sylius,Rvanlaak/Sylius,Rvanlaak/Sylius,torinaki/Sylius,kayue/Sylius,loic425/Sylius,bretto36/Sylius,Ejobs/Sylius,jjanvier/Sylius,101medialab/Sylius,lchrusciel/Sylius,nakashu/Sylius,venyii/Sylius,loic425/Sylius,sweoggy/Sylius,gseidel/Sylius,regnisolbap/Sylius,GSadee/Sylius,davalb/Sylius,Pitoune/Sylius,Niiko/Sylius,mkilmanas/Sylius,psren/Sylius,NeverResponse/Sylius,jjanvier/Sylius,jvahldick/Sylius,torinaki/Sylius,torinaki/Sylius,ReissClothing/Sylius,Mozan/Sylius,GSadee/Sylius,ezecosystem/Sylius,Mozan/Sylius,ezecosystem/Sylius,gmoigneu/platformsh-integrations,mkilmanas/Sylius,loic425/Sylius,DorianCMore/Sylius,pjedrzejewski/Sylius,venyii/Sylius,danut007ro/Sylius,cdaguerre/Sylius,Lowlo/Sylius,Brille24/Sylius,itinance/Sylius,gorkalaucirica/Sylius,lchrusciel/Sylius,pjedrzejewski/Sylius,Niiko/Sylius,Sylius/Sylius,Ejobs/Sylius,Joypricecorp/Sylius,videni/Sylius,cdaguerre/Sylius,inssein/Sylius,okwinza/Sylius,inssein/Sylius,steffenbrem/Sylius,TheMadeleine/Sylius,davalb/Sylius,videni/Sylius,Pitoune/Sylius,gruberro/Sylius,vihuvac/Sylius,michalmarcinkowski/Sylius,sweoggy/Sylius,itinance/Sylius,pjedrzejewski/Sylius,vihuvac/Sylius,michalmarcinkowski/Sylius,lchrusciel/Sylius,DorianCMore/Sylius,patrick-mcdougle/Sylius,gmoigneu/platformsh-integrations,Joypricecorp/Sylius,NeverResponse/Sylius,mkilmanas/Sylius,PyRowMan/Sylius,MichaelKubovic/Sylius,gseidel/Sylius,gmoigneu/platformsh-integrations,mheki/Sylius,venyii/Sylius,ylastapis/Sylius,itinance/Sylius,davalb/Sylius,pamil/Sylius,DorianCMore/Sylius,PyRowMan/Sylius,Rvanlaak/Sylius,videni/Sylius,diimpp/Sylius,bitbager/Sylius,danut007ro/Sylius,PyRowMan/Sylius,Joypricecorp/Sylius,gruberro/Sylius,danut007ro/Sylius,ReissClothing/Sylius,TheMadeleine/Sylius,coudenysj/Sylius,Sylius/Sylius,davalb/Sylius,PyRowMan/Sylius,jjanvier/Sylius,ktzouno/Sylius,pjedrzejewski/Sylius,ReissClothing/Sylius,mbabker/Sylius,jjanvier/Sylius,gabiudrescu/Sylius,psren/Sylius,gmoigneu/platformsh-integrations,mheki/Sylius,GSadee/Sylius,Lowlo/Sylius,Lowlo/Sylius,Arminek/Sylius,mheki/Sylius,nakashu/Sylius,NeverResponse/Sylius,Pitoune/Sylius,CoderMaggie/Sylius,TheMadeleine/Sylius,venyii/Sylius,101medialab/Sylius,inssein/Sylius,pamil/Sylius,steffenbrem/Sylius,jvahldick/Sylius,dragosprotung/Sylius,cdaguerre/Sylius,Sylius/Sylius,patrick-mcdougle/Sylius,Niiko/Sylius,gseidel/Sylius,CoderMaggie/Sylius,NeverResponse/Sylius,davalb/Sylius,mbabker/Sylius,MichaelKubovic/Sylius,kayue/Sylius,dragosprotung/Sylius,danut007ro/Sylius,patrick-mcdougle/Sylius,Rvanlaak/Sylius,mbabker/Sylius,gabiudrescu/Sylius,gorkalaucirica/Sylius,gseidel/Sylius,ktzouno/Sylius,steffenbrem/Sylius,nakashu/Sylius,Zales0123/Sylius,ktzouno/Sylius,patrick-mcdougle/Sylius,steffenbrem/Sylius,coudenysj/Sylius,Brille24/Sylius,gorkalaucirica/Sylius,jvahldick/Sylius,DorianCMore/Sylius,Brille24/Sylius,torinaki/Sylius,okwinza/Sylius,vihuvac/Sylius