Merge pull request #9 from osusec/dependabot/pip/docs/tornado-6.4.2

build(deps): bump tornado from 6.0.4 to 6.4.2 in /docs

Author: cacama-valvata

docs/requirements.txt

@@ -49,7 +49,7 @@ six==1.15.0
     # via
     #   livereload
     #   lunr
-tornado==6.0.4
+tornado==6.4.2
     # via
     #   livereload
     #   mkdocs