Fixes #2789: Require minimum Composer API version.

[grasmash]

No description provided.

[bhasselbeck]

I think the version of composer still needs to be newer.

[grasmash]

Composer's docs say that's the current version of composer-plugin-api?

[bhasselbeck]

Does this roll out at least 1.4.1 of composer?

The root cause seems to be older Composer versions (including 1.1.3 and 1.3.2) that apparently doesn't work with Drupal Scaffold: drupal-composer/drupal-scaffold#72

[grasmash]

I know Composer != composer-plugin-api, but I'm having trouble getting a list of composer-plugin-api versions and corresponding Composer versions.

[grasmash]

https://github.com/composer/composer/blob/14c77130e8f717ceb154720e1abefafe99124cb9/src/Composer/Plugin/PluginInterface.php#L30

[grasmash]

Yeah so this doesn't do the trick...

[grasmash]

I'm not even sure that it's possible to require a specific version of Composer. Wish we had more detail on what was broken. What part of the newer Composer version is required? I guess it's not composer-plugin-api. Is there an error that you can share?

[grasmash]

This won't fix the issue, but it won't hurt either.