Repository branch compare doesn't work if the branch name contains slashes.

[vekien]

Issue

If a branch name has slashes, the compare function does not work and throws an error

Replicate:

<?php

require __DIR__ . "/vendor/autoload.php";

use Gitlab\Client;

$client = new Client();
$client->setUrl("url");
$client->authenticate("token", Client::AUTH_HTTP_TOKEN);

$comparison = $client->repositories()->compare(
    123,
    "fix/branch_name",
    "develop"
);

print_r($comparison);

Thrown:

Fatal error: Uncaught Gitlab\Exception\RuntimeException: 404 Ref Not Found in gitlab-test/vendor/m4tthumphrey/php-gitlab-api/src/HttpClient/Plugin/ExceptionThrower.php:78
Stack trace:
#0 gitlab-test/vendor/m4tthumphrey/php-gitlab-api/src/HttpClient/Plugin/ExceptionThrower.php(53): Gitlab\HttpClient\Plugin\ExceptionThrower::createException(404, '404 Ref Not Fou...')

[stale]

This issue has been automatically marked as stale because there has been no recent activity. It will be closed after 30 days if no further activity occurs. Thank you for your contributions.