prepare release 0.7 (#326)

* prepare release 0.7

* correct whastnew

* enh: update contributors, add permanent zenodo url

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Co-authored-by: Sylvain Chevallier <sylain.chevallier@universite-paris-saclay.fr>

prepare release 0.6 (#291)

version 0.5

bump verstion to 0.4

0.2.7

version 0.2.6

update doc for release

update gitignore

Merge pull request #11 from kingjr/fix_eigen_convergence

scipy for eigh