chore: release 2.0.0 (googleapis#28)

🤖 I have created a release \*beep\* \*boop\* 
---
## [2.0.0](https://www.github.com/googleapis/python-kms/compare/v1.4.0...v2.0.0) (2020-07-30)


### ⚠ BREAKING CHANGES

* migrate to microgenerator. (googleapis#16)

### Features

* migrate to microgenerator. See [Migration Guide](https://github.com/googleapis/python-kms/blob/release-v2.0.0/UPGRADING.md). ([googleapis#16](https://www.github.com/googleapis/python-kms/issues/16)) ([605f757](https://www.github.com/googleapis/python-kms/commit/605f7577a9a9f1a2b39fa69da7e250b5f70e945e))

---


This PR was generated with [Release Please](https://github.com/googleapis/release-please).

chore: release 1.4.0 (googleapis#9)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py [ci skip]

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release 1.3.0 (googleapis#5)

Release kms 1.2.1 (#9011)

* Release 1.2.1

* Adjust changelog grouping.

Release 1.2.0 (#8756)

Release 1.1.0 (#8492)

Release kms 1.0.0 (#7337)

* Release 1.0.0

* Update release status in setup.py

Release kms 0.2.1 (#6990)

* Release 0.2.1

Release kms-0.2.0 (#6034)

Release kms 0.1.0 (#5667)

* Release 0.1.0
* add kms to docs