is/== issue in width.py

[davethomas074]

Small thing here - My linter is complaining about the code here and here, because we should really be using == for string comparison, not is, right?

if bintype == "log": vs if bintype is "log"

I looked through the issues and didn't see anyone else bringing this up. I'm happy to submit a PR but I wanted to bring it up here, before I just went ahead and did that.

Please let me know if a quick PR for this would be welcomed!

[e-koch]

A PR would be appreciated! Thanks!