Added deprecation notice

[j-rewerts]

Outlined our current timeline for deprecation.

@clayreimann I'd love to get your eyes on this, just to make sure I'm not pushing something you or the original authors don't want.

[codecov-io]

Codecov Report

Merging #573 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #573 +/- ##
=======================================
Coverage 90.93% 90.93% =======================================
Files 12 12 Lines 419 419 =======================================
Hits 381 381 Misses 38 38

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.93%. Comparing base (bf3a408) to head (d3795d0).
⚠️ Report is 36 commits behind head on master.
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Additional details and impacted files

@@ Coverage Diff @@## master #573 +/- ##
=======================================
Coverage 90.93% 90.93% =======================================
Files 12 12 Lines 419 419 =======================================
Hits 381 381 Misses 38 38 

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