Allow HHVM builds to fail

Author: yguedidi

.travis.yml

@@ -14,6 +14,12 @@ matrix:
       dist: trusty
     - php: hhvm-nightly
       dist: trusty
+  # Allow failures until Travis build includes HHVM 3.20.2 which fix the issue with composer (see http://hhvm.com/blog/2017/06/07/hhvm-3-20.html)
+  allow_failures:
+    - php: hhvm
+      dist: trusty
+    - php: hhvm-nightly
+      dist: trusty
 
 before_install:
   - if [[ $TRAVIS_PHP_VERSION = hhv* ]]; then echo hhvm.php7.all=1 >> /etc/hhvm/php.ini; fi