message: added section for 3.1.0
diff: @@ -9,6 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  - Sections
  +## [3.1.0] - 2020-?-?
  +### Added
  +### Changed
  +### Removed
  +- Removed: jsdom no longer a dependency in `package.json` ([gitbrent](https://github.com/gitbrent))
  +
  +
  +
  ## [3.0.1] - 2020-01-07
  ### Changed
  - Fixed: JSZip not found under Node.js [\#638](https://github.com/gitbrent/PptxGenJS/issue/638) ([rse](https://github.com/rse))
  