use the default phpunit installed in travis

oscarotero · oscarotero · commit fe4d3af73f95 · 2015-11-06T12:17:36.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -16,5 +16,5 @@ before_install:
   - composer install
 
 script:
-  - './vendor/bin/phpunit'
+  - 'phpunit'
   - './vendor/bin/php7cc ./src'
