message: Use querystring lib
diff: @@ -17,7 +17,7 @@ limitations under the License.
  'use strict';
  import url from 'url';
  -import URLSearchParams from 'url-search-params';
  +import qs from 'querystring';
  import React from 'react';
  import MatrixClientPeg from '../../../MatrixClientPeg';
  import PlatformPeg from '../../../PlatformPeg';
  @@ -127,10 +127,10 @@ export default React.createClass({
  // Append scalar_token as a query param if not already present
  this._scalarClient.scalarToken = token;
  const u = url.parse(this.props.url);
  - const params = new URLSearchParams(u.search);
  - if (!params.get('scalar_token')) {
  - params.set('scalar_token', encodeURIComponent(token));
  - u.search = params.toString();
  + const params = qs(u.search);
  + if (!params.scalar_token) {
  + params.scalar_token = encodeURIComponent(token);
  + u.search = qs.stringify(params);
  }
  this.setState({
  