add prefer source

Stephan Wentz · Stephan Wentz · commit a08f54fb671a · 2013-09-23T09:49:21.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,6 @@ php:
   - 5.4
   - 5.5
 
-before_script: composer install
+before_script: composer install --prefer-source
 
 script: phpunit -c tests
