Log tinuous version at start of run

[jwodder]

Closes #130.

[codecov-commenter]

Codecov Report

Merging #133 (7e64d8c) into master (37513a4) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   70.96%   70.89%   -0.08%     
==========================================
  Files          10       10              
  Lines         961      962       +1     
  Branches      142      142              
==========================================
  Hits          682      682              
- Misses        223      227       +4     
+ Partials       56       53       -3     

Impacted Files	Coverage Δ
src/tinuous/__main__.py	53.47% <100.00%> (+1.72%)	⬆️
src/tinuous/github.py	51.27% <0.00%> (-1.28%)	⬇️

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[yarikoptic]

thanks!