Update README.md

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# CHEATSHEET FOR POTATO MAKE
# POTATO MAKE
Potato Make is a scheme library that aims to simplify the task of
maintaining, updating, and regenerating programs. It is inspired by
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A hash table called `%makevars` has string keys. These procedures
are syntax that add quotation marks around `key`, so you call them without the quotes on
`key`. The returned value of `$` is a string, or an empty string on failure.
You define makevars in the script, in the environment, or on the command line.
($ KEY) -> "VAL"