Update CHANGELOG.md [ci skip] (#2)

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Author: 47erbot

CHANGELOG.md

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+# Changelog
+
+## [v0.6.0](https://github.com/scala-exercises/sbt-exercise/tree/v0.6.0) (2020-04-27)
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+[Full Changelog](https://github.com/scala-exercises/sbt-exercise/compare/9f7daa2dad25250cd1ef0636fce8418b97f0b3e9...v0.6.0)
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*