Add nightly versions of PHP and HHVM

Author: yguedidi

.travis.yml

@@ -9,8 +9,11 @@ cache:
 matrix:
   include:
     - php: 7.1
+    - php: nightly
     - php: hhvm
       dist: trusty
+    - php: hhvm-nightly
+      dist: trusty
 
 before_install:
   - travis_retry composer self-update
@@ -20,7 +23,7 @@ install:
   - travis_retry composer install --prefer-dist --no-interaction
 
 before_script:
-  - if [[ $TRAVIS_PHP_VERSION = hhvm ]]; then echo hhvm.php7.all=1 >> /etc/hhvm/php.ini; fi
+  - if [[ $TRAVIS_PHP_VERSION = hhvm* ]]; then echo hhvm.php7.all=1 >> /etc/hhvm/php.ini; fi
 
 script:
   - vendor/bin/phpcs