Integrate new path-to-regexp with trailing optionals (#2644)

Fix #2497

Ref pillarjs/path-to-regexp#176

services/matrix/matrix.service.js

@@ -191,8 +191,7 @@ module.exports = class Matrix extends BaseJsonService {
   static get route() {
     return {
       base: 'matrix',
-      format: '([^/]+)',
-      capture: ['roomAlias'],
+      pattern: ':roomAlias',
       queryParams: ['server_fqdn'],
     }
   }