Track the evolution of sklearn API

[sdvillal]

This would be a POC, maybe useful for other important libs. Perhaps just save a pickle (but then document what needs not to change) + something less faithful but more durable, like a yaml. With these historical infos, write a "differences of API between versions" report as sketched here:

whatami/whatami/wrappers/what_sklearn.py

Lines 697 to 704 in fcb58c3

	# TODO: store a history of this (maybe pickle) that can help supporting more easily new sklearn versions
	# So report too:
	# - changes in required parameters
	# - new parameters
	# - removed parameters
	# - changes in parameter default values
	# Plus some automatic way to try to catch errors in my definition of non-id values
	# This is WIP until then