Merge pull request mnapoli#49 from glensc/patch-1

exclude website and docs from composer install

Merge pull request mnapoli#44 from Nyholm/patch-1

Support for Symfony 4

Merge pull request mnapoli#39 from mnapoli/psr-11

Migrate to PSR-11 and PHP 7.0

Fix tests

Document mnapoli#26

Support command aliases (mnapoli#24)

Make the descriptions setter fluent (mnapoli#22)

Merge pull request mnapoli#20 from tentacode/patch-1

Enable usage of symfony/console ~3.0

Documentation for mnapoli#17

Use the new php-di/invoker package