Add bb8-tonic to README.md

[lewiszlw]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.27%. Comparing base (0cb8d94) to head (71f69a2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   80.27%   80.27%           
=======================================
  Files           6        6           
  Lines         644      644           
=======================================
  Hits          517      517           
  Misses        127      127           

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