Fix warnings

[rettinghaus]

Using newer versions of pyparsing throws several deprecation warnings.
I set the minimal version for pyparsing to 3.0.0 and updated it's usage to silence the warnings and keep it future proof.

[aweakley]

@cameron-simpson please could you review this one? If we're introducing a new minimum version of pyparsing, I think we should increment our version number?

[cameron-simpson]

This looks good to me.
I don't think this introduces any breaking changes or new features, so I would expect to bump the release to just 5.0.1.
The new >=3.0.0 should ensure a smooth update for end users.

[cameron-simpson]

If we're introducing a new minimum version of pyparsing, I think we should increment our version number?

I think just 5.0.1 for the next release.

I'd just merge this unless there's some "prospective next release" field I need to be updating?

[aweakley]

Ok great, thank you I'll merge it. Thanks very much @rettinghaus