message: Remove invalid object in karma webpack config
  root is replaced with modules in webpack 4
diff: @@ -200,9 +200,6 @@ module.exports = function (config) {
  'matrix-react-sdk': path.resolve('test/skinned-sdk.js'),
  'sinon': 'sinon/pkg/sinon.js',
  },
  - root: [
  - path.resolve('./test'),
  - ],
  modules: [
  path.resolve('./test'),
  "node_modules"
  