Can't install MutaTesting through composer

[Ethtezahl]

Hi.

I tried to install MutaTesting by following your instructions, but I got this error:

Your requirements could not be resolved to an installable set of packages.

Problem 1
- halleck45/mutatesting dev-master requires halleck45/php-metrics master -> no matching package found.
- halleck45/mutatesting 0.0.2 requires halleck45/php-metrics master -> no matching package found.
- Installation request for halleck45/mutatesting @dev -> satisfiable by halleck45/mutatesting[0.0.2, dev-master].

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.

[armetiz]

This is linked to this PR : #14