Update CHANGELOG.md [ci skip] (#79)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 47erbot

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [v0.6.2](https://github.com/scala-exercises/exercises-fpinscala/tree/v0.6.2) (2020-04-27)
+
+[Full Changelog](https://github.com/scala-exercises/exercises-fpinscala/compare/v0.6.1...v0.6.2)
+
 ## [v0.6.1](https://github.com/scala-exercises/exercises-fpinscala/tree/v0.6.1) (2020-04-27)
 
 [Full Changelog](https://github.com/scala-exercises/exercises-fpinscala/compare/v0.6.0...v0.6.1)