Making Under- and Overflow bins default in histograms

[afroch]

Summary

This pull request introduces the following changes

• Changing the default of the usage of under- and overflow bins in the histograms. By default, under- and overflow bins are now used in all histograms.

Relates to the following issues

• Closes #217

Conformity

• [X] Changelog entry
• [X] Documentation

[codecov[bot]]

Codecov Report

Merging #218 (0686544) into main (7c81712) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #218   +/-   ##
=======================================
  Coverage   97.24%   97.24%           
=======================================
  Files          35       35           
  Lines        3338     3338           
=======================================
  Hits         3246     3246           
  Misses         92       92           

Files	Coverage Δ
puma/histogram.py	95.85% <ø> (ø)
puma/tests/test_histogram.py	100.00% <100.00%> (ø)

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