update readme

Author: dzchilds

README.md

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 This is the course book for the Introduction to Exploratory Data Analysis with R course in the Department of Animal and Plant Sciences at the University of Sheffield. It is published using R Markdown and the [bookdown](https://github.com/rstudio/bookdown) package. These are very good. You should use them.
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-## To do list
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-Nothing here currently thank god...