Failed to install this plugin on Sylius 1.0.9

[gabiudrescu]

gabiudrescu@localhost:~/dev/SyliusStandard$ composer require bitbag/dhl24-pl-shipping-export-plugin
Using version ^1.0 for bitbag/dhl24-pl-shipping-export-plugin
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for bitbag/dhl24-pl-shipping-export-plugin ^1.0 -> satisfiable by bitbag/dhl24-pl-shipping-export-plugin[v1.0].
    - bitbag/dhl24-pl-shipping-export-plugin v1.0 requires bitbag/shipping-export-plugin dev-master -> satisfiable by bitbag/shipping-export-plugin[dev-master] but these conflict with your requirements or minimum-stability.

Installation failed, reverting ./composer.json to its original content.
gabiudrescu@localhost:~/dev/SyliusStandard$ 

composer.json:

{
    "require": {
        "php": "^7.1",
        "sylius/sylius": "^1.0.4",
        "bitbag/shipping-export-plugin": "^1.0",
    }
}

I think the problem lies in the composer.json of this plugin, as it requires dev-master of bitbag/shipping-export-plugin while composer.json from sylius states prefer-stable.

messing around with versions to force installing dev-master of bitbag/shipping-export-plugin should not be an option.

[damonsson]

Thanks! Fixed by #7