Fix travis build for HHVM

[66Ton99]

Fix

sudo cp ~/.phpenv/versions/$(phpenv version-name)/etc/php-fpm.conf.default ~/.phpenv/versions/$(phpenv version-name)/etc/php-fpm.conf
cp: cannot stat `/home/travis/.phpenv/versions/hhvm/etc/php-fpm.conf.default': No such file or directory
The command "sudo cp ~/.phpenv/versions/$(phpenv version-name)/etc/php-fpm.conf.default ~/.phpenv/versions/$(phpenv version-name)/etc/php-fpm.conf" failed and exited with 1 during .