Add ability to look up the latest docker-compose version from Github API

[robinreinhardt]

This small changes add the ability to get the latest docker-compose version from Github API when docker_compose_version is "latest"

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[geerlingguy]

I like this.

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[jorianvo]

Please be aware that this code is now broken due to the release of compose v2 i.e. when you now try to get the latest release you'll receive a 404. This is due to the fact that in compose v2 the assets are renamed from e.g.
docker-compose-Linux-x86_64 to docker-compose-linux-amd64.

[geerlingguy]

Hmm... is there an easy way to work around that?

[robinreinhardt]

Unfortunately I guess this can not be solved easily.
The download link structure is really messed up across the versions.
Here what I got so far:

version 1: version number without "v", Linux, x86_64
version 2.0.0: version with "v", linux, amd64
since version 2.0.1: version with "v", linux, x86_64

That's why it's not possible to downgrade the version from 2 to 1 like mentioned on #378

Gladly report if someone can create a logic for this link structure.

Perhaps we should consider deprecating compose version 1 in this role.