Release 1.6.1

[solegalli]

Hey @dlaprins @ClaudioSalvatoreArcidiacono @Morgan-Sell and @glevv

Small release to fix some bugs and add small enhancements to existing classes.

@dlaprins I don't know your name so I mention you as your github username.

Let me know if you'd like me to change something.

Thank you so much!

[codecov]

Codecov Report

Merging #674 (d0a72e1) into main (e73772d) will increase coverage by 0.06%.
The diff coverage is 99.17%.

@@            Coverage Diff             @@
##             main     #674      +/-   ##
==========================================
+ Coverage   97.91%   97.98%   +0.06%     
==========================================
  Files         100      100              
  Lines        3748     3827      +79     
  Branches      726      751      +25     
==========================================
+ Hits         3670     3750      +80     
+ Misses         29       28       -1     
  Partials       49       49              

Impacted Files	Coverage Δ
feature_engine/datetime/datetime_subtraction.py	94.66% <ø> (ø)
feature_engine/tags.py	100.00% <ø> (ø)
feature_engine/selection/drop_psi_features.py	99.40% <98.55%> (+1.08%)	⬆️
feature_engine/creation/relative_features.py	100.00% <100.00%> (ø)
feature_engine/encoding/rare_label.py	100.00% <100.00%> (ø)
feature_engine/imputation/drop_missing_data.py	100.00% <100.00%> (ø)
feature_engine/selection/shuffle_features.py	100.00% <100.00%> (ø)
feature_engine/transformation/reciprocal.py	100.00% <100.00%> (ø)
..._engine/variable_handling/_variable_type_checks.py	92.30% <100.00%> (+1.00%)	⬆️

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