Update .travis.yml

Author: Nyholm

.travis.yml

@@ -4,15 +4,15 @@ php:
     - 5.3
     - 5.4
     - 5.5
-
+    - 5.6
+    - hhvm
+ 
 env:
   - SYMFONY_VERSION=2.3.*
-  - SYMFONY_VERSION=2.4.*
-  - SYMFONY_VERSION=dev-master
 
 before_script:
   - composer self-update
-  - echo 'memory_limit = -1' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+  - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "memory_limit = -1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi;' 
   - composer require symfony/symfony:${SYMFONY_VERSION} --prefer-source
 
 script: phpunit --coverage-text
@@ -24,3 +24,11 @@ notifications:
 matrix:
   allow_failures:
     - env: SYMFONY_VERSION=dev-master
+    - php: hhvm
+  include:
+    - php: 5.5
+      env: SYMFONY_VERSION=2.4.*
+    - php: 5.5
+      env: SYMFONY_VERSION=2.5.*
+    - php: 5.5
+      env: SYMFONY_VERSION=dev-master