Move "php-http/guzzle6-adapter" to "require-dev"
Move "php-http/guzzle6-adapter" to "require-dev"

It is required only by "hwi/oauth-bundle" which is in "require-dev" as well.

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