update link to pymc port of DBDA code

Author: cluhmann

docs/source/learn/books.md

@@ -50,7 +50,7 @@ Principled introduction to Bayesian data analysis, with practical exercises. The
 
 [Book website](https://sites.google.com/site/doingbayesiandataanalysis/home)
 
-[PyMC 3.x port of the second edition's code](https://github.com/JWarmenhoven/DBDA-python)
+[PyMC port of the second edition's code](https://github.com/cluhmann/DBDA-python)
 
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