[BUG] Zulip integration - missing whitespace character in message

[mateuszmandera]

In the Zulip integration code (ref #92)

leantime/src/domain/projects/services/class.projects.php

Line 236 in 081d45d

$prepareChatMessage .= "".$url['link']."";

the message content is created:

                $prepareChatMessage = "**Project: ".$projectName."** \n\r".$message;
                if($url !== false){
                    $prepareChatMessage .= "".$url['link']."";
                }

and there's no whitespace character before the $url. Leading to the message looking like:

Project: xxxx
Xxxxxxhttps://example.com

The bugged message was reported by a user to us at https://github.com/zulip/zulip/ but it looks like a bug in the integration.