Update README.rst

Add link to performance notebook in the README.

Author: lmcinnes

README.rst

@@ -14,8 +14,7 @@ Based on the paper:
     In: Advances in Knowledge Discovery and Data Mining, Springer, pp 160-172.
     2013
 
-Notebooks `comparing HDBSCAN to other clustering algorithms <http://nbviewer.jupyter.org/github/lmcinnes/hdbscan/blob/master/notebooks/Comparing%20Clustering%20Algorithms.ipynb>`_, 
-and explaining `how HDBSCAN works <http://nbviewer.jupyter.org/github/lmcinnes/hdbscan/blob/master/notebooks/How%20HDBSCAN%20Works.ipynb>`_ are available.
+Notebooks `comparing HDBSCAN to other clustering algorithms <http://nbviewer.jupyter.org/github/lmcinnes/hdbscan/blob/master/notebooks/Comparing%20Clustering%20Algorithms.ipynb>`_, explaining `how HDBSCAN works <http://nbviewer.jupyter.org/github/lmcinnes/hdbscan/blob/master/notebooks/How%20HDBSCAN%20Works.ipynb>`_ and `comparing performance with other python clustering implementations <http://nbviewer.jupyter.org/github/lmcinnes/hdbscan/blob/master/notebooks/Benchmarking%20scalability%20of%20clustering%20implementations.ipynb>`_ are available.
 
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 How to use HDBSCAN