Update mapreduce-python description.

Author: donnemartin

README.md

@@ -60,7 +60,7 @@ IPython Notebook(s) demonstrating Hadoop MapReduce with mrjob functionality.
 
 | Notebook | Description |
 |--------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|
-| [mapreduce-python](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/mapreduce/mapreduce-python.ipynb) | Supports MapReduce jobs in Python with [mrjob](https://github.com/Yelp/mrjob), running them locally or on Hadoop clusters. Demonstrates mrjob code, unit test, and config file to analyze Amazon S3 bucket logs on Elastic MapReduce.  [Disco](https://github.com/discoproject/disco/) is another python-based alternative.|
+| [mapreduce-python](http://nbviewer.ipython.org/github/donnemartin/data-science-ipython-notebooks/blob/master/mapreduce/mapreduce-python.ipynb) | Runs MapReduce jobs in Python, executing jobs locally or on Hadoop clusters. Demonstrates Hadoop Streaming in Python code with unit test and [mrjob](https://github.com/Yelp/mrjob) config file to analyze Amazon S3 bucket logs on Elastic MapReduce.  [Disco](https://github.com/discoproject/disco/) is another python-based alternative.|
 
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