add composer/composer to require

[samsonasik]

@jails This is to be able to use composer's ClassMapGenerator as your comment at kahlan/docs#5 (comment)

[jails]

I think the best solution is put this in the documentation. If you need to load non PSR-0 compatible classes simply add "composer/composer": "^1.2" in your require-dev section and use Composer\Autoload\ClassMapGenerator; in your kahlan config file to generate a class map.

[samsonasik]

Ok 👍