Bug: read timeout not handled correctly

[rndsrc]

Even the read timeout is not handle correctly.

2021-04-12_18.00.00:  70%|███████   | 147/209 [1:39:07<41:48, 40.46s/it]
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 438, in _error_catcher
    yield
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 764, in read_chunked
    self._update_chunk_length()
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 694, in _update_chunk_length
    line = self._fp.fp.readline()
  File "/usr/lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib/python3.7/ssl.py", line 1052, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib/python3.7/ssl.py", line 911, in read
    return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/requests/models.py", line 753, in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 572, in stream
    for line in self.read_chunked(amt, decode_content=decode_content):
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 793, in read_chunked
    self._original_response.close()
  File "/usr/lib/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/lib/python3.7/dist-packages/urllib3/response.py", line 443, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='nomads.ncep.noaa.gov', port=443): Read timed out.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/ucast", line 11, in <module>
    load_entry_point('ucast==0.1.3', 'console_scripts', 'ucast')()
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/ucast/__main__.py", line 73, in mktab
    save(outfile, mkdf(site, cycle, test))
  File "/usr/local/lib/python3.7/dist-packages/ucast/utils.py", line 47, in ucast_dataframe
    gfs = uc.gfs.GFS(site, cycle, hr)
  File "/usr/local/lib/python3.7/dist-packages/ucast/weather/gfs/core.py", line 33, in __init__
    r = request(data_url(site, cycle, product, gridsz))
  File "/usr/local/lib/python3.7/dist-packages/ucast/request.py", line 45, in request
    r = requests.get(url, timeout=(ctime, rtime))
  File "/usr/local/lib/python3.7/dist-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python3.7/dist-packages/requests/sessions.py", line 697, in send
    r.content
  File "/usr/local/lib/python3.7/dist-packages/requests/models.py", line 831, in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
  File "/usr/local/lib/python3.7/dist-packages/requests/models.py", line 760, in generate
    raise ConnectionError(e)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='nomads.ncep.noaa.gov', port=443): Read timed out.
Creating "GLT/2021-04-12_18.00.00.tsv" ...
Error: Process completed with exit code 1.