Update README.md

[ao]

Issue #, if available:

Updating to reference the correct Lambda character.

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[codecov-commenter]

Codecov Report

Merging #407 (3e94719) into main (ce10e61) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #407   +/-   ##
=======================================
  Coverage   71.63%   71.63%           
=======================================
  Files          19       19           
  Lines        1040     1040           
=======================================
  Hits          745      745           
  Misses        228      228           
  Partials       67       67           

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[bmoffatt]

cute :)