message: Updated CHANGELOG.md for v3.0.1
diff: ## Change Log
  +### v3.0.1 (2019/12/06)
  +- [#117](https://github.com/sapientglobalmarkets/react-querybuilder/pull/117) Fixed a rule default value on add/change (@xxsnakerxx)
  +
  ### v3.0.0 (2019/11/29)
  - [#115](https://github.com/sapientglobalmarkets/react-querybuilder/pull/115) Add ruleGroup-header div (@jakeboone02)
  