Merge pull request #159 from Maks3w/patch-1

Promote HHVM.

Author: bighappyface

.travis.yml

@@ -12,7 +12,6 @@ php:
 matrix:
     allow_failures:
         - php: 7
-        - php: hhvm
 
 install:
   - sudo apt-get -y install pypy python-sphinx graphviz