Add docstring to __init__.py

[jwodder]

So that there's something to show if a user runs pydoc tinuous.

This PR also aligns the __author__ etc. dunder variables in __init__.py with the settings in setup.cfg.

[codecov-commenter]

Codecov Report

Merging #109 (d3a8d9d) into master (d724f18) will increase coverage by 26.51%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #109       +/-   ##
===========================================
+ Coverage   44.45%   70.96%   +26.51%     
===========================================
  Files           9       10        +1     
  Lines         893      899        +6     
  Branches      134      134               
===========================================
+ Hits          397      638      +241     
+ Misses        495      204      -291     
- Partials        1       57       +56     

Impacted Files	Coverage Δ
src/tinuous/__init__.py	100.00% <100.00%> (ø)
src/tinuous/_version.py	100.00% <0.00%> (ø)
src/tinuous/util.py	86.36% <0.00%> (+6.81%)	⬆️
src/tinuous/config.py	92.63% <0.00%> (+18.94%)	⬆️
src/tinuous/github.py	49.50% <0.00%> (+19.00%)	⬆️
src/tinuous/base.py	86.50% <0.00%> (+24.60%)	⬆️
src/tinuous/travis.py	60.90% <0.00%> (+32.72%)	⬆️
src/tinuous/appveyor.py	72.61% <0.00%> (+40.47%)	⬆️
src/tinuous/__main__.py	55.38% <0.00%> (+55.38%)	⬆️

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[yarikoptic]

Looks LGTM, thank you @jwodder !