Enabled "Type hints (PEP 484) support for the Sphinx autodoc extension and refactor docstrings and enforce using flake8-docstrings

[senwu]

No description provided.

[codecov]

Codecov Report

Merging #69 into master will decrease coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   89.27%   89.05%   -0.23%     
==========================================
  Files          38       38              
  Lines        1632     1635       +3     
  Branches      326      327       +1     
==========================================
- Hits         1457     1456       -1     
- Misses         91       93       +2     
- Partials       84       86       +2     

Flag	Coverage Δ
#unittests	89.05% <100.00%> (-0.23%)	⬇️

Impacted Files	Coverage Δ
src/emmental/__init__.py	100.00% <ø> (ø)
src/emmental/_version.py	100.00% <ø> (ø)
src/emmental/data.py	84.04% <ø> (ø)
src/emmental/learner.py	80.86% <ø> (ø)
src/emmental/logging/__init__.py	100.00% <ø> (ø)
src/emmental/logging/checkpointer.py	88.23% <ø> (ø)
src/emmental/logging/log_writer.py	100.00% <ø> (ø)
src/emmental/logging/logging_manager.py	100.00% <ø> (ø)
src/emmental/logging/tensorboard_writer.py	100.00% <ø> (ø)
src/emmental/meta.py	86.48% <ø> (ø)
... and 28 more