chore(Dockerfile): Remove WORKFLOW_RELEASE env var

doc(CHANGELOG.md): add entry for v2.0.0

doc(CHANGELOG.md): add entry for v2.0.0-rc2

Merge pull request #83 from vdice/release-v2.0.0-rc1

doc(CHANGELOG.md): [skip ci] add entry for v2.0.0-rc1

Merge pull request #77 from jchauncey/beta4

doc(CHANGELOG.md): update for v2.0.0-beta4

releasing workflow

releasing workflow beta2

Deis workflow v2 beta1