Convert to v2 addon

[SergeAstapov]

As this addon provides only run-time functionality hence it's the great candidate for v2 addon conversion.

My thought process is following:

1. land Move ember-cli-htmlbars to devDependencies #57, Bump eslint-plugin-qunit from 7.0.0 to 7.2.0 #58, Run ember-cli-update to v4.2 to align with the latest addon blueprint #59
2. release new minor 1.3.0
3. land Drop Node.js 8, 10, 11, 13, 15 support #44
4. convert to monorepo Convert to monorepo #63
5. convert addon to v2
6. release new major 2.0.0

@chriskrycho any thoughts, concerns?

[chriskrycho]

On this one, that seems good to me here, with the caveat that we need to cut a minor release bumping this to use the latest major of tracked-maps-and-sets first—that unblocks some consumers who are unable to use the current major of this at the same time as they are using the current major of tracked-built-ins, which is depending on a newer version of tracked-maps-and-sets.

[SergeAstapov]

@chriskrycho now I got what you meant. However this addon does not depend on tracked-maps-and-sets any more.

Which means you may cut minor right now and I'll start working on v2 conversion which indeed will be slated for next major.

Update: created #63 which we can land once minor release goes out.

[chriskrycho]

Ah, nice – I didn't remember that. Very good! I'll cut a minor release tomorrow bundling up all the stuff we've done lately and then we can get a new major out.

[boris-petrov]

@chriskrycho - still waiting on this release! :)

[SergeAstapov]

Created #65 instead of this one as v2 addon format is just part of the major release.