Add missing method to MR API

Author: jubianchi

lib/Gitlab/Api/MergeRequests.php

@@ -43,6 +43,11 @@ public function merge($project_id, $mr_id, array $params)
         return $this->put('projects/'.urlencode($project_id).'/merge_request/'.urlencode($mr_id).'/merge', $params);
     }
 
+    public function showComments($project_id, $issue_id)
+    {
+        return $this->get('projects/'.urlencode($project_id).'/issues/'.urlencode($issue_id).'/notes');
+    }
+    
     public function addComment($project_id, $mr_id, $note)
     {
         return $this->post('projects/'.urlencode($project_id).'/merge_request/'.urlencode($mr_id).'/comments', array(

lib/Gitlab/Model/MergeRequest.php

@@ -101,17 +101,17 @@ public function addComment($note)
         return Note::fromArray($this->getClient(), $this, $data);
     }
 
-	public function showComments()
-	{
-		$notes = array();
-		$data = $this->api('mr')->showComments($this->project->id, $this->id);
+    public function showComments()
+    {
+        $notes = array();
+        $data = $this->api('mr')->showComments($this->project->id, $this->id);
 
-		foreach ($data as $note) {
-			$notes[] = Note::fromArray($this->getClient(), $this, $note);
-		}
+        foreach ($data as $note) {
+            $notes[] = Note::fromArray($this->getClient(), $this, $note);
+        }
 
-		return $notes;
-	}
+        return $notes;
+    }
 
     public function isClosed()
     {