sebastian/diff dependancy need redeclaration

Hello,

I’m a little bit losing in the composer requirements…

$ cat composer.json
{
    "require": {
        "halleck45/mutatesting": "*@dev"
    }
}
$ ./composer.phar install
Loading composer repositories with package information
Installing dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for halleck45/mutatesting *@dev -> satisfiable by halleck45/mutatesting[dev-master].
    - halleck45/mutatesting dev-master requires sebastian/diff 1.0.*@dev -> no matching package found.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

Redeclare sebastian/diff dependancy:

$ ./composer.phar require sebastian/diff '1.0.*@dev'
composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing twig/twig (v1.13.0)
    Loading from cache

  - Installing sebastian/diff (dev-master 222e193)
    Cloning 222e1939856808fe4d02ec856a08721858d0217b

  - Installing symfony/event-dispatcher (v2.3.0)
    Loading from cache

  - Installing symfony/process (v2.3.0)
    Loading from cache

  - Installing symfony/config (v2.2.2)
    Loading from cache

  - Installing symfony/console (v2.3.0)
    Loading from cache

  - Installing halleck45/mutatesting (dev-master bc182d4)
    Cloning bc182d4e3b983270e5c03b3493b5d4fab041b602

symfony/event-dispatcher suggests installing symfony/dependency-injection ()
symfony/event-dispatcher suggests installing symfony/http-kernel ()
Writing lock file
Generating autoload files

Halleck45 / MutaTesting

sebastian/diff dependancy need redeclaration #3