Update Project.toml, bump to version 0.8.3

[mkitti]

Prepare for patch release due to pre-1.0 status.

[mkitti]

@nhz2 preparing for release with just #52 . Any objections?

There's so much more I want to fix here, but it can wait for a later release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.96%. Comparing base (89cd7ed) to head (c39bad2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   36.96%   36.96%           
=======================================
  Files           5        5           
  Lines         560      560           
=======================================
  Hits          207      207           
  Misses        353      353           

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