run cargo publish, package

[jtmoon79]

Test that cargo publish and cargo package succeed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.96%. Comparing base (21ee9b7) to head (aa6a2d5).

Additional details and impacted files

@@           Coverage Diff           @@
##            0.5.x    #1540   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files          37       37           
  Lines       16662    16662           
=======================================
  Hits        15656    15656           
  Misses       1006     1006           

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[pitdicker]

Thank you! What errors would this catch that our regular build and test CI runs don't catch?

[pitdicker]

Just added a similar CI job for chrono-tz in https://github.com/chronotope/chrono-tz/pull/158. So I now see its use :smile:.

@jtmoon79 Want to finish up this PR?