Release zcash_keys version 0.5.0

[nuttycom]

No description provided.

[str4d]

utACK 4720f62

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.38%. Comparing base (d904e86) to head (8c98397).
Report is 6 commits behind head on release/zcash_primitives-0.20.0.

Additional details and impacted files

@@                         Coverage Diff                         @@
##           release/zcash_primitives-0.20.0    #1617      +/-   ##
===================================================================
- Coverage                            56.39%   56.38%   -0.01%     
===================================================================
  Files                                  148      148              
  Lines                                19232    19232              
===================================================================
- Hits                                 10845    10844       -1     
- Misses                                8387     8388       +1     

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