Remove CI on HHVM
Remove CI on HHVM

HHVM announced that they will stop working on PHP compatibility for HHVM
and Symfony dropped support for HHVM. So there is no point keeping it on
CI.

Incenteev/translation-checker-bundle,Incenteev/IncenteevTranslationCheckerBundle,Incenteev/IncenteevTranslationCheckerBundle,Incenteev/translation-checker-bundle