Merge pull request #253 from opentok/remove-hhvm

Removing HHVM support

Author: dragonmantank

.travis.yml

@@ -5,7 +5,6 @@ php:
 - 5.6
 - 7.0
 - 7.1
-- hhvm-3.30
 before_script:
 - curl -sSfL -o ~/.phpenv/versions/hhvm/bin/phpunit https://phar.phpunit.de/phpunit-5.7.phar
 - travis_retry composer install