Release 4.0.0

[SGenheden]

The plugins folder is missing

[codecov-commenter]

Codecov Report

Attention: 92 lines in your changes are missing coverage. Please review.

Comparison is base (82f19c4) 80.02% compared to head (6e9e809) 84.06%.

Files	Patch %	Lines
aizynthfinder/tools/make_stock.py	26.31%	26 Missing and 2 partials :warning:
aizynthfinder/context/scoring/scorers.py	89.87%	10 Missing and 6 partials :warning:
aizynthfinder/context/config.py	80.00%	9 Missing and 2 partials :warning:
aizynthfinder/context/stock/queries.py	77.27%	8 Missing and 2 partials :warning:
aizynthfinder/search/mcts/node.py	89.06%	2 Missing and 5 partials :warning:
aizynthfinder/interfaces/aizynthapp.py	50.00%	5 Missing :warning:
aizynthfinder/search/retrostar/cost.py	86.66%	4 Missing :warning:
aizynthfinder/aizynthfinder.py	84.61%	1 Missing and 1 partial :warning:
aizynthfinder/analysis/utils.py	0.00%	1 Missing :warning:
aizynthfinder/context/collection.py	50.00%	1 Missing :warning:
... and 7 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #141 +/- ## ========================================== + Coverage 80.02% 84.06% +4.04% ========================================== Files 65 56 -9 Lines 4995 4676 -319 Branches 828 863 +35 ========================================== - Hits 3997 3931 -66 + Misses 807 556 -251 + Partials 191 189 -2 ```

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