Update requirements.txt

requirements.txt

@@ -49,7 +49,7 @@ scikit-learn==0.19.1
 scipy==1.1.0
 seaborn==0.8.1
 selenium==3.141.0
-SQLAlchemy==1.2.6
+SQLAlchemy==1.3.0
 statsmodels==0.9.0
 tqdm==4.28.1
 widgetsnbextension==3.4.2