add releaseNotes property to published dandiset

[satra]

this will allow change of the UI to add a field alongside publishing for releaseNotes.

we should also consider adding optional CHANGES and README files to the Dandiset model.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c3a74cc) 97.66% compared to head (1d3e6c1) 97.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #185   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files          18       18           
  Lines        1799     1801    +2     
=======================================
+ Hits         1757     1759    +2     
  Misses         42       42           

Flag	Coverage Δ
unittests	97.66% <100.00%> (+<0.01%)	⬆️

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[yarikoptic]

better add some record to some unittest to exercise this optional field, so there would be a "detector" for removing/breaking it.

[yarikoptic]

hm, I am confused why schemata version is not changed... we are adding a field so should get at least a patch version boost I guess in comparison to the latest release -- may be back then we had already some changes staged. Should rebase/push again and see what happens. will do now

[satra]

this will indeed have a schema change, but we only added the update to schema version in a relevant corresponding PR.