Determine / Implement `CHANGELOG.md` strategy for `1.x` (main) && `2.x` to avoid merge conflicts when merging "up"

[jrushlow]

How should we handle the changelog going forward. e.g. CHANGELOG-1.x.md && CHANGELOG-2.x.md? I feel like keeping a single CHANGELOG.md will cause merge conflicts but I could be wrong.

This strategy would also apply to reset-password-bundle when it comes up for a version bump.

cc @weaverryan @bocharsky-bw

[weaverryan]

I see the problem... but I'm not sure it'll be so bad, as we won't be developing SO much in the older branches. I say we keep it simple with just CHANGELOG.md and deal with any conflicts. They should be easy to solve.

[bocharsky-bw]

Agree with Ryan

[jrushlow]

sounds good to me!
fixed in #173