code: function getAllCustomLabels () {
    return new Promise (async (resolve, reject) => {
      let options = {
        'qs': {'fields': 'id,name'}
      };
      
      try {
        let response = await  this.callCustomLabelsApi(options);
        resolve(response);
      } catch (e) {
        reject(e);
      }
    });
  }
docs: Retrieves the list of all custom labels.
  @return {Promise<Object>}  The API response
  @memberof  Client#
  @example
  let field = ['name', 'id']; //optional
  Client.getAllCustomLabels(fields)
  .then(res => {
  console.log(res);
  // {
  //   "data": [
  //     { "name": "myLabel", "id": "1001200005003"},
  //     { "name": "myOtherLabel", "id": "1001200005002"}
  //   ],
  //   "paging": {
  //     "cursors": {
  //       "before": "QVFIUmx1WTBpMGpJWXprYzVYaVhabW55dVpyc",
  //       "after": "QVFIUmItNkpTbjVzakxFWGRydzdaVUFNNnNPaU"
  //     }
  //   }
  // }
  });