Add deprecation message for dev command

[chasefleming]

Closes #???

Description

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For contributor use:

• [ ] Targeted PR against master branch
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [ ] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [ ] Re-reviewed Files changed in the Github PR explorer
• [ ] Added appropriate labels

[codecov-commenter]

Codecov Report

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

Project coverage is 28.47%. Comparing base (606ca7a) to head (876962b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1799   +/-   ##
=======================================
  Coverage   28.47%   28.47%           
=======================================
  Files          95       95           
  Lines        6490     6490           
=======================================
  Hits         1848     1848           
  Misses       4462     4462           
  Partials      180      180           

Flag	Coverage Δ
unittests	28.47% <ø> (ø)

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