Update README.md

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 This directory contains 3 versions of
 [Peter Norvig's `lis.py` interpreter](https://norvig.com/lispy.html)
-for Scheme.
+for a subset of [Scheme](https://en.wikipedia.org/wiki/Scheme_(programming_language)).
 
 * `original/`: Norvig's `lis.py` unchanged, `lispy.py` with
 [minor changes](https://github.com/norvig/pytudes/pull/106) to run on Python 3,