🚅 Add a bullet point to the Slack message (#24)

* Add a bullet point to the Slack message

* Add bullet point to message

src/var/task/handler.py

@@ -122,7 +122,7 @@ def handler(event, context):  # pylint: disable=unused-argument
             if supplier_config[2]:
                 send_slack(
                     slack_channel=supplier_config[2],
-                    message=f"A file uploaded by `{supplier}` has been transferred to `{supplier_config[3]}`.\n - `{file_name}`",
+                    message=f"A file uploaded by `{supplier}` has been transferred to `{supplier_config[3]}`.\n  • `{file_name}`"
                 )
             else:
                 print(f"No Slack channel configured for `{supplier}`")