Add reminder to upgrade to 1.0.0

[jbants]

Add a friendly reminder to upgrade to stac version 1.0.0 for older stac versions.

[jonhealy1]

@jbants Should this wait for the 1.0.0 release or should we ask people to upgrade to 1.0.0-rc.2?

[jbants]

Let's wait for the STAC 1.0.0 release.

[jbants]

relates to #115

[gadomski]

@jbants this milestone should probably be removed/changed, yes?

[jonhealy1]

I did add this reminder to stac-check but it's not in stac-validator yet

[gadomski]

Yeah, but the milestone for this issue is 2.3.0, and we're already on 3.0.0?

[jonhealy1]

Haha true

[jonhealy1]

Should I make this a milestone to 3.1.0? I don't think it's needed - it's more of a thing for stac-check which gives hints and warnings and not just pure validation

[gadomski]

Yeah, this would just be a feature addition so it could go into a v3.1.0. However, I haven't looked to see whether there's been any breaking changes since v3.0.0 that would require a major version bump, we should check that before we decide what the next milestone is.