docs: add deprecation notice

[kdmccormick]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.22%. Comparing base (db01cde) to head (08e0191).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #207   +/-   ##
=======================================
  Coverage   58.22%   58.22%           
=======================================
  Files          25       25           
  Lines         395      395           
  Branches       66       66           
=======================================
  Hits          230      230           
  Misses        149      149           
  Partials       16       16           

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[coveralls]

Pull Request Test Coverage Report for Build 10813142750

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.473%

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Totals
Change from base Build 10741783659:	0.0%
Covered Lines:	168
Relevant Lines:	305

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💛 - Coveralls