Add a full code example to the docs if a TAN is required

[kmille]

Hey, I just added some docs. What still confuses me is that the docs state for the send_tan function:

Returns: | Currently no response

Source: https://python-fints.readthedocs.io/en/latest/tans.html#sending-the-tan

[codecov[bot]]

Codecov Report

Merging #124 (9975a4e) into master (bc1c81e) will not change coverage. The diff coverage is n/a.

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##           master     #124   +/-   ##
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  Coverage   87.48%   87.48%           
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  Files          23       23           
  Lines        3117     3117           
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  Hits         2727     2727           
  Misses        390      390           

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[kmille]

I updated and tested (without TAN, SMS-TAN and flicker TAN) the PR.

[kmille]

Ready to merge or still some suggestions?

[kmille]

Hey, small merge reminder :) I think there is something wrong with the tests (It only didn't run on Python 3.4).

[ogai]

Very helpful addition! Thanks! It saved my day. Two improvement ideas:

1. If there is only one TAN-method available, just set it without bothering the user with a question.
2. A more simple example for the common case of getting the TAN by SMS would be nicer:

if isinstance(result, NeedTANResponse):
    tan = input('Please enter TAN:')
    result = client.send_tan(result, tan.strip())

[kmille]

Hey @raphaelm still interested in merging?