Update README.md

README.md

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-# minimize [![Python 3.6+](https://img.shields.io/badge/python-3.6+-blue.svg)](https://www.python.org/downloads/release/python-360/)
+# minimize [![Python 3.5+](https://img.shields.io/badge/python-3.5+-blue.svg)](https://www.python.org/downloads/release/python-360/)
 
 This repository is a Python implementation of C.E. Rasmussen's [minimize](http://learning.eng.cam.ac.uk/carl/code/minimize/) function which finds a (local) minimum of a (nonlinear) multivariate function. The function uses conjugate gradients and approximate linesearches based on polynomial interpolation with Wolfe-Powel conditions. The user supplies a function which returns the function value as well as the partial derivatives with respect to the variables to be minimized.
 
 Notes:
-- Tested for python >= 3.6
+- Tested for python >= 3.5
 
 **Table of Contents:**
 1. [minimize usage](#minimize-usage)