fix 'Permission denied' on travis

.travis.yml

@@ -12,7 +12,8 @@ addons:
     - build-essential
     - g++
 before_install:
-  - mkdir -pv /var/lib/crafatar/{faces,helms,skins,renders,capes}
+  - mkdir -pv images/{faces,helms,skins,renders,capes}
+  - sed -i.bak 's/\/var\/lib\/crafatar\///g' config.example.js
 script:
   - npm run-script test-travis
 notifications: