message: Updated CHANGELOG.md for v3.0.0
diff: ## Change Log
  +### v3.0.0 (2019/11/29)
  +- [#115](https://github.com/sapientglobalmarkets/react-querybuilder/pull/115) Add ruleGroup-header div (@jakeboone02)
  +
  ### v2.5.1 (2019/11/11)
  - [#113](https://github.com/sapientglobalmarkets/react-querybuilder/pull/113) Bugfix/not property (@romanlamsal)
  