Fix log units

[kahaaga]

• Fixes #256

Summary:

• Introduces a convenience method convert_logunit that converts between numbers computed with different logarithm bases. This method is exported as a convenience function, and is tested, to ensure the errors in #256 can never occur. However, it is not documented yet. We can decide later if it should be.
• Consistently use convert_logunit for all differential entropy estimator code and tests.
• Updates changelog.
• Increments package version.

[codecov[bot]]

Codecov Report

Merging #257 (1a14d38) into main (72f457b) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
+ Coverage   81.06%   81.14%   +0.07%     
==========================================
  Files          49       49              
  Lines        1236     1241       +5     
==========================================
+ Hits         1002     1007       +5     
  Misses        234      234              

Impacted Files	Coverage Δ
src/entropies_estimators/nearest_neighbors/Gao.jl	100.00% <100.00%> (ø)
...rc/entropies_estimators/nearest_neighbors/Goria.jl	100.00% <100.00%> (ø)
...estimators/nearest_neighbors/KozachenkoLeonenko.jl	100.00% <100.00%> (ø)
.../entropies_estimators/nearest_neighbors/Kraskov.jl	100.00% <100.00%> (ø)
src/entropies_estimators/nearest_neighbors/Lord.jl	100.00% <100.00%> (ø)
src/entropies_estimators/nearest_neighbors/Zhu.jl	100.00% <100.00%> (ø)
...entropies_estimators/nearest_neighbors/ZhuSingh.jl	100.00% <100.00%> (ø)
...ies_estimators/order_statistics/AlizadehArghami.jl	100.00% <100.00%> (ø)
...rc/entropies_estimators/order_statistics/Correa.jl	100.00% <100.00%> (ø)
.../entropies_estimators/order_statistics/Ebrahimi.jl	100.00% <100.00%> (ø)
... and 2 more

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[kahaaga]

As long as convert_logunit isn't documented, it's not part of the public API, so we can adjust code internally later if necessary.

For now, this PR fixes all upstreams bugs. I am therefore merging as soon as tests pass.

[Datseris]

In the future note that bugfixes increment the patch version (third number), not the minor verison (second number)