readme typo

Author: CamDavidsonPilon

Chapter3_MCMC/IntroMCMC.ipynb

@@ -96,7 +96,7 @@ Thanks to all our contributing authors, including (in chronological order):
 We would like to thank the Python community for building an amazing architecture. We would like to thank the 
 statistics community for building an amazing architecture. 
 
-Similarly, the book is only possible because of the [PyMC](http://github.com/pymc-dev/pymc) library. A big thanks to the core devs of PyMC: Chris Fonnesbeck, Anand Patil, David Huard and John Salvatier.
+Similarly, the book is only possible because of the [PyMC](http://github.com/pymc-devs/pymc) library. A big thanks to the core devs of PyMC: Chris Fonnesbeck, Anand Patil, David Huard and John Salvatier.
 
 One final thanks. This book was generated by IPython Notebook, a wonderful tool for developing in Python. We thank the IPython 
 community for developing the Notebook interface. All IPython notebook files are available for download on the GitHub repository.