Disable xdebug for travis build
Disable xdebug for travis build

see https://docs.travis-ci.com/user/languages/php#Disabling-preinstalled-PHP-extensions and https://getcomposer.org/doc/articles/troubleshooting.md#xdebug-impact-on-composer
> Compared to a cli command run with "xdebug" enabled a speed improvement by a factor of up to 3 is not uncommon.

wolv-dev/shopware,oktupol/shopware,simkli/shopware,wesolowski/shopware,k10r/shopware,jhit/shopware,jhit/shopware,mreiss/shopware,DerRidda/shopware,Pttde/shopware,DerRidda/shopware,arvatis/shopware,Sunchairs/shopware,simkli/shopware,giginos/shopware,wesolowski/shopware,JonidBendo/shopware,oktupol/shopware,Pttde/shopware,NetInventors/shopware,NetInventors/shopware,s-haase/shopware,Sunchairs/shopware,mreiss/shopware,jhit/shopware,giginos/shopware,jochenmanz/shopware,VIISON/shopware-4,bcremer/shopware,egoistIT/shopware,oktupol/shopware,k10r/shopware,mreiss/shopware,wolv-dev/shopware,Pttde/shopware,s-haase/shopware,philippmahlow/shopware,wolv-dev/shopware,egoistIT/shopware,arvatis/shopware,arvatis/shopware,jochenmanz/shopware,k10r/shopware,wesolowski/shopware,philippmahlow/shopware,giginos/shopware,NetInventors/shopware,Sunchairs/shopware,philippmahlow/shopware,Sunchairs/shopware,jochenmanz/shopware,egoistIT/shopware,mreiss/shopware,bcremer/shopware,philippmahlow/shopware,JonidBendo/shopware,egoistIT/shopware,arvatis/shopware,oktupol/shopware,jhit/shopware,DerRidda/shopware,giginos/shopware,giginos/shopware,NetInventors/shopware,philippmahlow/shopware,bcremer/shopware,VIISON/shopware-4,k10r/shopware,JonidBendo/shopware,VIISON/shopware-4,s-haase/shopware,s-haase/shopware,bcremer/shopware,k10r/shopware,DerRidda/shopware,oktupol/shopware,wesolowski/shopware,simkli/shopware,JonidBendo/shopware,wesolowski/shopware,VIISON/shopware-4,NetInventors/shopware,simkli/shopware,simkli/shopware,JonidBendo/shopware,Pttde/shopware,VIISON/shopware-4,egoistIT/shopware,arvatis/shopware,bcremer/shopware,jochenmanz/shopware,DerRidda/shopware,mreiss/shopware,wolv-dev/shopware,wolv-dev/shopware,s-haase/shopware,jhit/shopware,jochenmanz/shopware,Sunchairs/shopware,Pttde/shopware