Fix version constraint to composer-plugin-api
Fix version constraint to composer-plugin-api

Jordi Boggiano wrote:
> Heya,
> 
> I am sending you this email because you have a Composer Plugin on
> https://packagist.org that requires the `composer-plugin-api` in
> version `*` or `1.0.0`.
> 
> Both of those are pretty dangerous:
> 
> - `*` would mean your plugin can get loaded in any future composer
> including 2.0, and will probably break.
> - `1.0.0` means that your plugin will not be loaded anymore as soon as
> we add functionality and bump the plugin api to 1.1+
> 
> The solution is simple, open your composer.json and replace that require with:
> 
>         "composer-plugin-api": "^1.0"
> 
> Sorry for the trouble, the documentation had "1.0.0" in the plugin
> example which mislead most plugin authors, but that is now fixed.
> 
> Cheers
kiesel/xp-composer-installer