updated links to nbviewer to view ipython notebooks

Author: culturedbun

README.md

@@ -8,4 +8,4 @@ Video: [http://www.youtube.com/watch?v=w26x-z-BdWQ](http://www.youtube.com/watch
 The notebooks can be viewed online with [IPython Notebook Viewer](http://nbviewer.ipython.org/)
 - [Basics.ipynb](http://nbviewer.ipython.org/github/estimate/pandas-exercises/blob/master/Basics.ipynb)
 - [BabyNames.ipynb](http://nbviewer.ipython.org/github/estimate/pandas-exercises/blob/master/BabyNames.ipynb)
-- [ElectionData.ipynb](https://github.com/estimate/pandas-exercises/blob/master/ElectionData.ipynb)
+- [ElectionData.ipynb](http://nbviewer.ipython.org/github/estimate/pandas-exercises/blob/master/Basics.ipynb)