Set max SDK version to `<3.0.0`?

[chalin]

@kevmoo - there is no upper bound on the SDK version, do you want it set for this package?

cc @kwalrath

[kevmoo]

CC @jcollins-g – this is not published. It's a copy used for our SDK.

[jcollins-g]

We should set it on the original and update the copy; pub package resolution is not used on SDK packages, but eventually it will be needed for the pub version of dartdoc

[devoncarew]

closing as assumed obsolete