divio doctor command breaks on python 3.7

[monikasulik]

Using windows 10 and python 3.7.3, this is the stacktrace I get:

PS J:\> divio doctor
Verifying your system setup
 OK  Login
Traceback (most recent call last):
  File "c:\users\xxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\check_system.py", line 25, in run_check
    utils.check_call(self.command, catch=False, silent=True)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\utils.py", line 162, in check_call
    return execute(subprocess.check_call, *popenargs, **kwargs)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\utils.py", line 145, in execute
    return func(*popenargs, **kwargs)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\subprocess.py", line 342, in check_call
    retcode = call(*popenargs, **kwargs)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\subprocess.py", line 323, in call
    with Popen(*popenargs, **kwargs) as p:
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\subprocess.py", line 1178, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\xxxx\AppData\Local\Programs\Python\Python37\Scripts\divio-script.py", line 11, in <module>
    load_entry_point('divio-cli==3.5.0', 'console_scripts', 'divio')()
  File "c:\users\xxxx\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "c:\users\xxxxxx\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "c:\users\xxxxxxxx\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\xxxx\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\click\decorators.py", line 27, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\cli.py", line 751, in doctor
    0 if check_requirements_human(obj.client.config, checks) else 1
  File "c:\users\xxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\check_system.py", line 243, in check_requirements_human
    for check, check_name, error in check_requirements(config, checks):
  File "c:\users\xxxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\check_system.py", line 222, in check_requirements
    errors = check().run_check()
  File "c:\users\xxxxxx\appdata\local\programs\python\python37\lib\site-packages\divio_cli\check_system.py", line 27, in run_check
    if exc.errno == os.errno.ENOENT:
AttributeError: module 'os' has no attribute 'errno'

A little bit of googling says that os.errno no longer exists in python3.7, so I'm assuming that's the culprit.