message: Update changelog for v19.2.0
diff: @@ -4,6 +4,16 @@ All notable changes to the project will be documented in this file.
  The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
  and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
  +## [19.2.0] - 2019-05-12
  +
  +### Added
  +- Method `deleteFile()` is now implemented
  +
  +### Changed
  +- Fixed return type for BlockstackNetwork.getAccountTokens
  +- Property `manifestURI` is now included in loaded manifest object
  +- The `src` directory is now included in the npm package
  +
  ## [19.1.0] - 2019-03-29
  ### Added
  