Merge pull request vinta#880 from gautamk/simpy

Adding SimPy to the Science section

Author: vinta

README.md

@@ -947,6 +947,7 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 * [statsmodels](https://github.com/statsmodels/statsmodels) - Statistical modeling and econometrics in Python.
 * [SymPy](https://github.com/sympy/sympy) - A Python library for symbolic mathematics.
 * [Zipline](https://github.com/quantopian/zipline) - A Pythonic algorithmic trading library.
+* [SimPy](https://bitbucket.org/simpy/simpy) -  A process-based discrete-event simulation framework.
 
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