kanban prints an error on unknown request type.

src/main.cr

@@ -312,6 +312,8 @@ IPC::Service.new "kanban" do |event|
 				type: "user",
 				user: user
 			}.to_json)
+		else
+			raise "Unknown request type: '#{message["type"]}'"
 		end
 	else
 		pp event