README highlighting

Author: Matthew J. Bryan

README.md

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 # py-combtest
-<mark>This lib still under construction</mark>
+<span style="background-color: #FFFF00">This lib still under construction</span>
 
 Testing using combinatorics, and the infrastructure to run those test cases in parallel, possibly across multiple machines.
 Includes human-readable descriptions of the generated test cases, and deterministic replay mechanisms.