code: function callReducers(actionName, actionData) {
      this.reducers.forEach(item => {
          this.state[item.stateKey] = item.reducer(this.state[item.stateKey], actionName, actionData);
      });
  }
docs: Call reducers
  @function callReducers
  @param {String} actionName - An action name
  @param {*} actionData - An action data
  @private