fix line break

Author: yasunariw

lib/config.atd

@@ -49,4 +49,5 @@ type secrets = {
   (* Slack bot token obtained via OAuth, enabling message posting to the workspace;
     if not provided initially, the first successful OAuth exchange will update this
     field both in memory and on disk *)
-  ?slack_access_token : string option;}
+  ?slack_access_token : string option;
+}