Bump tornado from 4.5.3 to 6.4.2 in /frameworks/Python/bottle
@@ -3,4 +3,4 @@ bottle-sqlalchemy==0.4.3
gunicorn==19.9.0
PyMySQL==0.8.0
SQLAlchemy==1.3.0
-tornado==4.5.3
+tornado==6.4.2