Sorting Algorithms IPython nb link is bad.

[BowenLiu92]

In the readme file, there is a hyperlink for the IPython notebook for Sorting Algorithms, but it's pointing to "404: Not Found".

Thanks.

[rasbt]

Thanks for the note, just fixed it. The link is https://github.com/rasbt/algorithms_in_ipython_notebooks/tree/master/ipython_nbs/sorting