Laravel 5 - cannot install laracasts/generators

I am trying to install Laravel 5 Extended Generators through Composer, using the following command: composer require laracasts/generators --dev.

I received this error message:

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

  Problem 1
    - The requested package way/generators dev-feature/laravel-5-stable could not be found.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setti                        ng
   see <http://ift.tt/1QfuRiU; for more details.

Read <http://ift.tt/1g1ylKI; for further common problems.

Installation failed, reverting ./composer.json to its original content.

The version of Laravel I am using is 5.2. What could be the problem here?

via Chebli Mohamed