add support for sphinx >=1.8.5

[mherkazandjian]

There seems to be an issue when sphinx==1.8.5 is used.

try

pip install -r requirements.txt

where requirements.txt has the following content:

pytest==6.1.2
docutils==0.15
sphinx==1.8.5
python-docx>=0.8.6
nose==1.3.7

the same behavior is observed for higher versions of sphinx, e.g 3.3.0.

I think this is related to unicode related text in the .rst files. #24 seems to be related.

another issue is with logger. There is a depracation warning that has been added in sphinx==1.8.5 for that.

[mherkazandjian]

the logger info error is fixed in 28e1e2b
still need to fix the unicode issue,

[mherkazandjian]

related pull request #27