Remove Symfony 3 from composer
Remove Symfony 3 from composer

Symfony 3 is not compatible with symfony-cmf/routing-bundle dependency.

Th3Mouk/SonataPageBundle,Aylarius/SonataPageBundle,Dunduro/SonataPageBundle,Aylarius/SonataPageBundle,grimpows/SonataPageBundle,grimpows/SonataPageBundle,Th3Mouk/SonataPageBundle,grimpows/SonataPageBundle,Dunduro/SonataPageBundle,Dunduro/SonataPageBundle,Aylarius/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,sonata-project/SonataPageBundle,Th3Mouk/SonataPageBundle,grimpows/SonataPageBundle,Dunduro/SonataPageBundle,Dunduro/SonataPageBundle,Aylarius/SonataPageBundle,Th3Mouk/SonataPageBundle,sonata-project/SonataPageBundle