message: Updated changelog for v2.2.0
diff: ## Change Log
  +### v2.2.0 (2019/08/29)
  +- [#95](https://github.com/sapientglobalmarkets/react-querybuilder/pull/95) Add formatQuery function (@jakeboone02)
  +- [#96](https://github.com/sapientglobalmarkets/react-querybuilder/pull/96) Added showCombinatorsBetweenRules option (@jakeboone02)
  +
  ### v2.1.0 (2019/08/27)
  -- [#94](https://github.com/sapientglobalmarkets/react-querybuilder/pull/94) Enhanced default ValueEditor to handle multiple input types (@jakeboone02)
  +- [#94](https://github.com/sapientglobalmarkets/react-querybuilder/pull/94) Enhanced default ValueEditor to handle multiple input types (#94) (@jakeboone02)
  ### v2.0.1 (2019/08/27)
  - [#93](https://github.com/sapientglobalmarkets/react-querybuilder/pull/93) Pass in new root to _notifyQueryChange (@pumbor)
  