Update README.md

Author: tirthajyoti

README.md

@@ -6,7 +6,7 @@ General statistics, mathematics related, and numerical/sceintific computing note
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 ### Requirements
-* **Python 3.5+**
+* **Python 3.6+**
 * **NumPy (`$ pip install numpy`)**
 * **Pandas (`$ pip install pandas`)**
 * **Scikit-learn (`$ pip install scikit-learn`)**