message: Advertise that we can scan QR codes even though we can't
  This is to fix RiotX not realizing it can scan QR codes. Follow up issue is
diff: @@ -32,7 +32,7 @@ import MatrixClientBackedSettingsHandler from "./settings/handlers/MatrixClientB
  import * as StorageManager from './utils/StorageManager';
  import IdentityAuthClient from './IdentityAuthClient';
  import { crossSigningCallbacks } from './CrossSigningManager';
  -import {SHOW_QR_CODE_METHOD} from "matrix-js-sdk/src/crypto/verification/QRCode";
  +import {SCAN_QR_CODE_METHOD, SHOW_QR_CODE_METHOD} from "matrix-js-sdk/src/crypto/verification/QRCode";
  interface MatrixClientCreds {
  homeserverUrl: string,
  @@ -221,6 +221,7 @@ class _MatrixClientPeg {
  verificationMethods: [
  verificationMethods.SAS,
  SHOW_QR_CODE_METHOD,
  + SCAN_QR_CODE_METHOD, // XXX: We don't actually support scanning yet!
  verificationMethods.RECIPROCATE_QR_CODE,
  ],
  unstableClientRelationAggregation: true,
  