Drop PHP 5.6 build on Travis CI
Drop PHP 5.6 build on Travis CI

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