travis: removed HHVM

Author: dg

.travis.yml

@@ -2,20 +2,12 @@ language: php
 php:
     - 5.6
     - 7.0
-    - hhvm
 
 env:
     - PHP_BIN=php
     - PHP_BIN=php-cgi
 
 matrix:
-    allow_failures:
-        - php: hhvm
-
-    exclude:
-        - php: hhvm
-          env: PHP_BIN=php-cgi
-
     include:
         - php: 5.6
           env: dependencies="--prefer-lowest --prefer-stable" PHP_BIN=php