Flanker dependencies break sensors with py2

[punkrokk]

Problem: The otherwise amazing flanker package does not pin a version of the tld package. The last version to support py2 is v0.10.

This results in a state when installing the email pack st2 pack install email where tld 0.11 is installed and since we are using sensors - things fail since they need to be py2.

In good news - flanker was pinned flanker>=0.9.0 so other needing the tld package pinned for py2, this will be a low risk change.

Solution: @bradchiappetta and I have forked flanker from and pinned tld==0.10 and tested in a clean install st2 pack install email.

We have also created a PR to the flanker project and will update this pack once our change is merged.