add functionality to fetch gitlab merge requests

gitlab/Connection.php

+<?php
+
+namespace GitLab;
+
+use GuzzleHttp\Client;
+
+class Connection
+{
+    /** @var Client */
+    private $client;
+
+    public function __construct(Client $client)
+    {
+        $this->client = $client;
+    }
+
+    public function mergeRequests($state = 'all') {
+
+        $url = env('GITLAB_URL') . '/merge_requests?scope=all&per_page=50&state='. $state;
+
+        $response = $this->client->request('GET', $url, ['headers' => ['Private-Token' => env('GITLAB_ACCESS_TOKEN')]]);
+
+        return collect(json_decode($response->getBody()));
+    }
+
+}
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