Require Guzzle 7.12.1 and drop Guzzle 6 support

Bump the minimum guzzlehttp/guzzle version to ^7.12.1 to remediate
CVE-2026-55568 / GHSA-wpwq-4j6v-78m3 (silent HTTPS-proxy downgrade to
cleartext). The advisory affects all versions below 7.12.1 and there is
no patched 6.x release, so support for Guzzle 6.x is dropped.

Because dropping a supported dependency major is a breaking change for
consumers, this is released as the new v4 major line (per SemVer and
the existing v1/v2/v3 branch convention).

Also adds an MIT LICENSE file and declares "license": "MIT" in
composer.json.

Prevent double urlencode when working with IDN domain names

Fix for working with IDN domain names

Add php 8 as supported dependency

Update composer to support php 8 projects.

Update dependencies and php version

• php 7.4 required
• updated dependencies
• remove stdClass instances
• archive combell-nl/combell-api and add notice in this repo

Updated samples v2

Samples were updated for v2 of the Combell API, but never released. Now a fresh install has v2 examples.

First release of the Combell API

This is the first release of the Combell API.