message: adding a changelog for 2.0.1
diff: ## Change Log
  -### 2.0.0 (2019/08/18)
  +### v2.0.1 (2019/08/27)
  +- [#93](https://github.com/sapientglobalmarkets/react-querybuilder/pull/93) Pass in new root to _notifyQueryChange (@pumbor)
  +- [#84](https://github.com/sapientglobalmarkets/react-querybuilder/pull/84) Add className prop to ValueEditor, pass it on to input element (#84) (@kkkrist)
  +
  +### v2.0.0 (2019/08/18)
  - [#87](https://github.com/sapientglobalmarkets/react-querybuilder/pull/87) Hooks rewrite and increased test coverage (@jakeboone02)
  - [#86](https://github.com/sapientglobalmarkets/react-querybuilder/pull/86) Upgrade dependencies and replace deprecated or unmaintained packages (@sapientglobalmarkets)
  - [#82](https://github.com/sapientglobalmarkets/react-querybuilder/pull/82) Removed type restrictions on Rule values (@jakeboone02)
  