tests(topostats): Compare versions as strings

[ns-rse]

Compares versions of .topostats as strings with a view to moving to storing the version of TopoStats that .topostats files were created in as a field in the HDF5 .topostats file itself.

Strings seem to be compared logically...

In [1]import topostats

In [2]: topostats.__release__
Out[2]: '2.3.2'

In [3]: topostats.__release__ > "0.2"
Out[3]: True

In [4]: "0.2.1" > "0.2"
Out[4]: True

In [5]: "0.2.0" >= "0.2"
Out[5]: True

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.88%. Comparing base (ac9753c) to head (cf2928b).
Report is 116 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
+ Coverage   74.62%   76.88%   +2.25%     
==========================================
  Files           8       10       +2     
  Lines         607      783     +176     
==========================================
+ Hits          453      602     +149     
- Misses        154      181      +27     

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