update changelog, push v0.7.28

update changelog, push v0.7.27

update nimblas, nimlapack deps, update changelog, push v0.7.26

update changelog, push v0.7.25

update changelog, push v0.7.24

update changelog, push v0.7.23

push v0.7.22

update changelog, push v0.7.21

update changelog, push version v0.7.20

Clarify numerical gradient signature (mratsim#581)

* clarify the signature of `numerical_gradient` for scalars

* update changelog

* push version v0.7.19