Streamlit: Support Tornado 6.0+

[danlester]

It would be great if Streamlit could support Tornado 6.0+ since the current requirement of <6.0 causes conflicts if other packages in the environment require 6.0+.

Thank you!

Dan

[jrhone]

Since we've dropped python 2 support, looks like we should be able to do this.

# 6.0 doesn't support Python 2
tornado = ">=5.0,<6.0"

Adding to the board.

[ZupoLlask]

Any update on this subject? 👍

[bozso11]

Any change on this? It tornado<6 conflicts with MLflow's req of tornado>6.0 and it would be great to be able to use both!