Retry downloads that fail with ConnectionError

[jwodder]

Closes #131.

[codecov-commenter]

Codecov Report

Merging #134 (d8f2d43) into master (37513a4) will decrease coverage by 2.87%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
- Coverage   70.96%   68.09%   -2.88%     
==========================================
  Files          10       10              
  Lines         961     1144     +183     
  Branches      142      214      +72     
==========================================
+ Hits          682      779      +97     
- Misses        223      309      +86     
  Partials       56       56              

Impacted Files	Coverage Δ
src/tinuous/base.py	85.78% <100.00%> (-0.48%)	⬇️
src/tinuous/appveyor.py	51.19% <0.00%> (-25.00%)	⬇️
src/tinuous/travis.py	39.09% <0.00%> (-24.55%)	⬇️
src/tinuous/github.py	55.96% <0.00%> (+3.42%)	⬆️
src/tinuous/__main__.py	60.49% <0.00%> (+8.74%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 37513a4...d8f2d43. Read the comment docs.

[yarikoptic]

hm, no codecov status in checks but at least there is a report (albeit making not much sense).. I guess we will see in next PR if codecov works

Thanks @jwodder for the fix, hopefully I would never inquire on what was the URL ;)

[jwodder]

Ping @yarikoptic — This PR is still open.

[yarikoptic]

oh, missed this one too. I guess we might need to use assignment functionality so PRs intended for my final review/merge could appear in my dashboard. thank you @jwodder !