Update the changelog for the 0.8.0 release

[nick-mobilecoin]

Current dependencies on/for this PR:

• main
  • PR #422
  • PR #423 👈

This comment was auto-generated by Graphite.

[codecov[bot]]

Codecov Report

Merging #423 (0d898ab) into nick/fix-coverage (5a926a2) will not change coverage. The diff coverage is n/a.

@@                Coverage Diff                 @@
##           nick/fix-coverage     #423   +/-   ##
==================================================
  Coverage              88.39%   88.39%           
==================================================
  Files                     40       40           
  Lines                   5643     5643           
==================================================
  Hits                    4988     4988           
  Misses                   655      655           

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