replace pyserial-asyncio with pyserial-asyncio-fast

[dotlambda]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.46%. Comparing base (521e425) to head (bc6d7ca).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #162      +/-   ##
==========================================
+ Coverage   46.42%   46.46%   +0.04%     
==========================================
  Files           8        8              
  Lines        1301     1302       +1     
==========================================
+ Hits          604      605       +1     
  Misses        697      697              

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[puddly]

Thanks!