removed composer self-update to try to fix 'composer/composer#4121'

oscarotero · oscarotero · commit de9d943e143c · 2015-07-20T14:50:12.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,7 +14,6 @@ matrix:
     - php: hhvm
 
 before_install:
-  - composer self-update
   - composer install
 
 script: ./vendor/bin/phpunit
