message: remove socket.io shim
diff: @@ -10,13 +10,11 @@ module.exports = {
  included(app) {
  this._super.apply(this, arguments);
  - let socketIoPath = require.resolve('socket.io-client/dist/socket.io.js');
  -
  - app.import(socketIoPath, {
  + app.import('node_modules/socket.io-client/dist/socket.io.js', {
  using: [
  {
  transformation: 'amd',
  - as: 'socket.io'
  + as: 'socket-io'
  }
  ]
  });
  