Update README.md

AllenDowney · web-flow · commit e3d40003da16 · 2018-01-08T10:12:38.000-05:00
diff --git a/README.md b/README.md
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 ===========
 
 LaTeX source, code examples, and exercise solutions for Think Python, 2nd edition, by Allen Downey.
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+You can download this book in PDF from [Green Tea Press](http://greenteapress.com/wp/think-python-2e/) or buy it in paper and other formats from [O'Reilly Media](http://shop.oreilly.com/product/0636920045267.do).
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+To build the book from source you will need a LaTeX installion.  I recommend the TeX Live distribution with the following packages:
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+* texlive-latex-base
+* texlive-latex-extra
+* texlive-fonts-recommended
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