Remove zipline

Zipline is no longer maintained (see quantopian/zipline#2841).

Author: VeckoTheGecko

README.md

@@ -1045,7 +1045,6 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 * [SimPy](https://gitlab.com/team-simpy/simpy) -  A process-based discrete-event simulation framework.
 * [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.
 
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