Made naming rules more lax and migration script more stable.

[kodek16]

This PR includes a hotfix from Szkopuł production, a simple test, and a version bump.

[codecov-io]

Codecov Report

Merging #70 into master will increase coverage by 2.17%.
The diff coverage is 93.75%.

@@            Coverage Diff            @@
##           master     #70      +/-   ##
=========================================
+ Coverage   76.43%   78.6%   +2.17%     
=========================================
  Files          26      27       +1     
  Lines        2130    2183      +53     
=========================================
+ Hits         1628    1716      +88     
+ Misses        502     467      -35

Impacted Files	Coverage Δ
setup.py	0% <ø> (ø)	⬆️
filetracker/scripts/migrate_test.py	100% <100%> (ø)
filetracker/servers/base.py	61.33% <50%> (-1.34%)	⬇️
filetracker/scripts/migrate.py	92% <84.21%> (+92%)	⬆️
filetracker/servers/files.py	93.27% <0%> (-0.85%)	⬇️
filetracker/scripts/progress_bar.py	87.5% <0%> (+6.25%)	⬆️

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[radeusgd]

Looks good to me, but I'd suggest adding one more test while you are at it.

[radeusgd]

If we've got tests for the migration script, maybe we could add a test that tries to upload a file with forbidden name and files to see if other files are migrated correctly in such a scenario?