Drop WIP from changelog command in Danger comment

danger/changelog/Dangerfile

@@ -53,9 +53,11 @@ end
 changelog_needed = (gitlab.mr_labels & NO_CHANGELOG_LABELS).empty?
 changelog_found = git.added_files.find { |path| path =~ %r{\A(ee/)?(changelogs/unreleased)(-ee)?/} }
+mr_title = gitlab.mr_json["title"].gsub(/^WIP: */, '')
+
 if git.modified_files.include?("CHANGELOG.md")
   fail "**CHANGELOG.md was edited.** Please remove the additions and create a CHANGELOG entry.\n\n" +
-    format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: gitlab.mr_json["title"], labels: presented_no_changelog_labels)
+    format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: mr_title, labels: presented_no_changelog_labels)
 end
 if changelog_needed
@@ -63,6 +65,6 @@ if changelog_needed
     check_changelog(changelog_found)
   else
     warn "**[CHANGELOG missing](https://docs.gitlab.com/ce/development/changelog.html).**\n\n" +
-      format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: gitlab.mr_json["title"], labels: presented_no_changelog_labels)
+      format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: mr_title, labels: presented_no_changelog_labels)
   end
 end