message: Chore: Update changelog for new release.
diff: +## X.Y.Z (INSERT_DATE_HERE)
  +
  +#### Minor Changes
  +- [Upgrade to TypeScript 2.3.1](https://github.com/SAP/chevrotain/pull/458)
  +
  +#### Documentation
  +- [Ensure chevrotain.d.ts is compatiable with noImplicitAny.](https://github.com/SAP/chevrotain/issues/459)
  +
  +
  +
  ## 0.28.1 (4-18-2017)
  #### Minor Changes
  