Removed nightly of HHVM and --dev from composer update

Author: mvriel

.travis.yml

@@ -4,20 +4,18 @@ php:
   - 5.6
   - 7.0
   - hhvm
-  - hhvm-nightly
 
 matrix:
   allow_failures:
     - php: hhvm
-    - php: hhvm-nightly
 
 cache:
   directories:
     - $HOME/.composer/cache
 
 script:
   - vendor/bin/phpunit --coverage-clover=coverage.clover -v
-  - composer update --no-interaction --prefer-source --dev
+  - composer update --no-interaction --prefer-source
   - vendor/bin/phpunit -v
 
 before_script: