Prepare release linfa-nn 0.7.2

[relf]

This PR is a follow-up of #391

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 36.36%. Comparing base (20b1dd2) to head (dff0dbe).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
algorithms/linfa-ica/src/fast_ica.rs	0.00%	2 Missing ⚠️
algorithms/linfa-trees/src/decision_trees/tikz.rs	0.00%	2 Missing ⚠️
...gorithms/linfa-preprocessing/src/linear_scaling.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
+ Coverage   36.11%   36.36%   +0.24%     
==========================================
  Files         101      101              
  Lines        6556     6553       -3     
==========================================
+ Hits         2368     2383      +15     
+ Misses       4188     4170      -18     

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