Update README.md

Author: CamDavidsonPilon

README.md

@@ -1,4 +1,4 @@
-Probabilistic Programming and Bayesian Methods for Hackers 
+Probabilistic Programming & Bayesian Methods for Hackers 
 ========
 ## *Using Python and PyMC*
 
@@ -87,7 +87,7 @@ Using the book
 
 The book can be read in three different ways, starting from most recommended to least recommended: 
 
-1. The most recommended option is to clone the repository and download the .ipynb files to your local machine. If you have IPython installed, you can view the 
+1. The most recommended option is to clone the repository to download the .ipynb files to your local machine. If you have IPython installed, you can view the 
 chapters in your browser *plus* edit and run the code provided (and try some practice questions). This is the preferred option to read
 this book, though it comes with some dependencies. 
     -  IPython 0.13 is a requirement to view the ipynb files. It can be downloaded [here](http://ipython.org/ipython-doc/dev/install/index.html)
@@ -97,9 +97,7 @@ this book, though it comes with some dependencies.
 2. The second, preferred, option is to use the nbviewer.ipython.org site, which display IPython notebooks in the browser ([example](http://nbviewer.ipython.org/urls/raw.github.com/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/master/Chapter1_Introduction/Chapter1_Introduction.ipynb)).
 The contents are updated synchronously as commits are made to the book. You can use the Contents section above to link to the chapters.
 
-3. The most traditional approach, but also not recommended, is to read the chapters as PDFs contained in the `previews` folder. The content
-in these PDFs is not guaranteed to be the most recent content as the PDFs are only compiled periodically. Similarly, the book will not be
-interactive.
+3. **PDF versions are coming.** PDFs are the least-prefered method to read the book, as pdf's are static and non-interactive. If PDFs are desired, they can be created dynamically using Chrome's builtin print-to-pdf feature.
 
 
 Installation and configuration
@@ -165,6 +163,10 @@ Thanks to all our contributing authors, including (in chronological order):
 -  [Vannessa Sabino](http://baniverso.com/)
 -  [Thomas Bratt](https://github.com/thomasbratt)
 -  [Nisan Haramati](https://github.com/nisanharamati)
+-  [Thomas Bratt](https://github.com/thomasbratt)
+-  [Robert Grant](https://github.com/bgrant)
+-  [Yaroslav Halchenko](https://github.com/yarikoptic)
+-  [Alex Garel](https://github.com/alexgarel)
 
 
 We would like to thank the Python community for building an amazing architecture. We would like to thank the