Made security-checker optional for HHVM run.

Author: h4cc

.travis.yml

@@ -17,7 +17,8 @@ script:
   # Try to install all requirements.
   - composer install
   # Check if there is a security issue with the required packages.
-  - bin/security-checker security:check composer.lock
+  # Skipping this check for HHVM, till this is merged: https://github.com/facebook/hhvm/issues/1859
+  - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then bin/security-checker security:check composer.lock; fi;'
 
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