upload time and error message missing from list_runs

[joaquinvanschoren]

Description

When you list runs, upload time and error message are not shown, even though they are returned by the OpenML API. It would be very handy if these can be added.

Steps/Code to Reproduce

import openml as oml
runs = oml.runs.list_runs(task=[2])
runs

Expected Results

{110: {'flow_id': 76,
          'run_id': 110,
          'setup_id': 17,
          'task_id': 2,
          'uploader': 1,
          'upload_time': '2016-04-06 23:30:40',
          'error_message': []
}

Actual Results

{110: {'flow_id': 76,
  'run_id': 110,
  'setup_id': 17,
  'task_id': 2,
  'uploader': 1},

Versions

Linux-4.14.79+-x86_64-with-Ubuntu-18.04-bionic
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0]
NumPy 1.14.6
SciPy 1.1.0
Scikit-Learn 0.20.2
OpenML 0.8.0

[mfeurer]

Added via #661.