slack msg: added space between timestamp and repo link in footer for commit

Author: dombong

lib/slack_message.ml

@@ -179,7 +179,7 @@ let populate_commit ?(include_changes = true) repository (api_commit : api_commi
   let fallback = sprintf "[%s] %s - %s" (Slack.git_short_sha_hash sha) commit.message commit.author.name in
   {
     (base_attachment repository) with
-    footer = Some (simple_footer repository ^ commit.committer.date);
+    footer = Some (simple_footer repository ^ " " ^ commit.committer.date);
     (*
     author_name = Some author.login;
     author_link = Some author.html_url;

test/slack_payloads.expected

@@ -587,7 +587,7 @@ will unfurl in #C047QTRD1CH
       "color": "#f6f8fa",
       "author_icon": "https://github.com/avatars/u/0",
       "text": "`<https://github.com/ahrefs/monorepo/commit/0d95302addd66c1816bce1b1d495ed1c93ccd478|0d95302a>` Update README.md - <https://github.com/Khady|Louis>\n_modified `README.md` (+1-1)_ on 2020-06-02",
-      "footer": "<https://github.com/ahrefs/monorobot|ahrefs/monorobot>2020-06-02T03:14:51Z"
+      "footer": "<https://github.com/ahrefs/monorobot|ahrefs/monorobot> 2020-06-02T03:14:51Z"
     }
   }
 }