Merge pull request #35 from eacheson/dependabot/pip/tornado-6.4.2

Bump tornado from 6.4.1 to 6.4.2

Author: eacheson

requirements.txt

@@ -60,7 +60,7 @@ Send2Trash==1.5.0
 six==1.12.0
 terminado==0.8.1
 testpath==0.4.2
-tornado==6.4.1
+tornado==6.4.2
 traitlets==4.3.2
 wcwidth==0.1.7
 webencodings==0.5.1