New Cloud Events SDK changes things significantly

[mattmoor]

Just wanted to give a heads up that the new Cloud Events SDK (v2.0.0-preview3) has significant changes that need to be picked up.

The simplest migration is likely to pick up the new version, and rewrite the current import paths to be rooted at github.com/cloudevents/sdk-go/legacy, which contains the older client. Then the new client can be picked up incrementally.

I looked into doing precisely this, but I wasn't smart enough to get go mod to work with some simple tinkering, so I wanted to at least open this to track.

cc @vdemeester @n3wscott

[n3wscott]

I will look into making go mod work, there might be some things I need to do to allow pulling the preview release. We will be doing an RC in the next couple weeks as we get closer to 2.0.0

[vdemeester]

/cc @afrittoli
/kind cleanup

[n3wscott]

I have cut a release called v2.0.0-preview4 that does work with go mod today.

[mattmoor]

I may try to give this a shot

[mattmoor]

@n3wscott have you bumped eventing contrib? Looks like they need to bump that to pull in the new CE lib.