bug #11058 Revert "Move "php-http/guzzle6-adapter" to "require-dev"" (pamil)
bug #11058 Revert "Move "php-http/guzzle6-adapter" to "require-dev"" (pamil)

This PR was merged into the 1.7-dev branch.

Discussion
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Reverts Sylius/Sylius#11057 - it is required by Payum.

Commits
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5ba9b638aef9c484867ad8219bc20b06c34bcbe0 Revert "Move "php-http/guzzle6-adapter" to "require-dev""

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