Fix use of wrong function to update issue milestone. (#366)

Fix #365.

Author: Zimmi48

bot-components/github/GitHub_automation.ml

@@ -168,14 +168,14 @@ let reflect_pull_request_milestone ~bot_info pr_closer_info =
     match pr_closer_info.milestone_id with
     | None ->
         (* No previous milestone: setting the one of the PR which closed the issue *)
-        GitHub_mutations.update_milestone_pull_request ~bot_info
-          ~pr_id:pr_closer_info.issue_id ~milestone
+        GitHub_mutations.update_milestone_issue ~bot_info
+          ~issue:pr_closer_info.issue_id ~milestone
     | Some previous_milestone when GitHub_ID.equal previous_milestone milestone
       ->
         Lwt_io.print "Issue is already in the right milestone: doing nothing.\n"
     | Some _ ->
-        GitHub_mutations.update_milestone_pull_request ~bot_info
-          ~pr_id:pr_closer_info.issue_id ~milestone
+        GitHub_mutations.update_milestone_issue ~bot_info
+          ~issue:pr_closer_info.issue_id ~milestone
         <&> ( GitHub_mutations.post_comment ~bot_info ~id:pr_closer_info.issue_id
                 ~message:
                   "The milestone of this issue was changed to reflect the one \