fix(retry): uses same shell

[urecio]

Description

• What change is being made and why?
  Adds shell to retry command
  Fixes on_retry_command not respecting shell choice #116

Testing

No new tests

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 2.51%. Comparing base (1139f99) to head (50dd28b).
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##           master    #123      +/-   ##
=========================================
- Coverage    2.53%   2.51%   -0.02%     
=========================================
  Files           3       3              
  Lines         158     159       +1     
  Branches       51      51              
=========================================
  Hits            4       4              
- Misses        141     142       +1     
  Partials       13      13              

[urecio]

@nick-fields hopefully you are ok with me adding a PR. I didn't ask beforehand because it was a quick one