Fix requirement Pygments

[lansman]

Now requirement is Pygments<=2.0,>=1.6

This is probably a bug, because current last version Pygments 2.0.2 doesn't match it.

If it is, you must exclude from top border minor version so it will became: Pygments<=2,>=1.6

[jamesls]

Yes, this appears to be a bug. The intent was to lock to the 1.x major version. I'll need to evaluate the latest changes in pygments 2.x to figure out if I can support both >=1.6 up to the latest 2, or if I just need to switch to locking to the 2.x major version.

Thanks for reporting.