Composer install from GitHub

[coresh]

The pull request provided with the ability

composer installing directly from Github (independent on packagist.org)

Allow installing directly from the github:

$ composer config repositories.inviqa__MX_PhinxMigrations git https://github.com/inviqa/MX_PhinxMigrations

Add the module to the require section of the composer file:

$ composer require inviqa/MX_PhinxMigrations