Merge pull request #51 from messagebird/travis-config-fix

Set distribution in travis config to precise

Author: samwierema

.travis.yml

@@ -1,4 +1,5 @@
 language: php
+dist: precise
 php:
     - 5.3
     - 5.4
@@ -13,6 +14,7 @@ matrix:
     allow_failures:
         - php: 7.0
         - php: 7.1
+        - php: hhvm
         - php: hhvm-nightly
 
 script: phpunit --verbose