Update src/db/roomstore.ts

Co-Authored-By: Half-Shot <will@half-shot.uk>

src/db/roomstore.ts

 /*
-Copyright 2018 matrix-appservice-discord
+Copyright 2019 matrix-appservice-discord
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.