Update README

README.md

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 My first big project in any new language is a character generator. It involves an understanding of functions, data types, randomness, and user input and output, so it's a good proof of language acquisition.
 
 (The D&D character generator is here because I forgot which system I was coding for and decided to do both.)
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+Make sure the files in `src/util` are somewhere your Go compiler can find them, either by relocating the files or by adding their directory to your `$GOPATH`.