Can't install with Composer

[ryanaddams]

Getting this when I run the installation as per the instructions:

$ composer require intervention/image

[RuntimeException]
Could not load package intervention/image in http://packagist.org: [UnexpectedValueException] Could not parse version constraint 4.x.x:
Invalid version string "4.x.x"
[UnexpectedValueException]
Could not parse version constraint 4.x.x: Invalid version string "4.x.x"

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--sort-packages] [--] []...

[olivervogel]

See: #472