V3.0.0 of SubQuery is a large release with a lot of new features. Although there are no breaking changes we felt that there was a large enough improvement to justify a major version bump. To use these new features please make sure to use the latest versions of the SubQuery dependencies in your project.
This allows users to upgrade projects at specific heights. This is useful with the network where there is currently no way to update a project if the contracts need updating or the chain has upgrades.