Drop hhvm support for now

.travis.yml

@@ -7,12 +7,11 @@ matrix:
         - php: 7
           env: deps=low
         - php: 7
-        - php: hhvm
     fast_finish: true
 
 before_script:
-  - if [ "`phpenv version-name`" != "hhvm" ]; then echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
-  - if [ "`phpenv version-name`" != "hhvm" ]; then echo "extension = amqp.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
+  - echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+  - echo "extension = amqp.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - if [ "$deps" == "low" ]; then composer update --prefer-source --prefer-lowest --prefer-stable; fi
   - if [ "$deps" != "low" ]; then composer install --prefer-source; fi