Merge pull request #454 from NREL/dependabot/pip/docs/tornado-6.5.1

Bump tornado from 6.4.2 to 6.5.1 in /docs

Author: mdeceglie

docs/notebook_requirements.txt

@@ -48,7 +48,7 @@ soupsieve==2.6
 terminado==0.18.1
 testpath==0.6.0
 tinycss2==1.3.0
-tornado==6.4.2
+tornado==6.5.1
 traitlets==5.14.3
 wcwidth==0.2.13
 webencodings==0.5.1