* add v1.2.0 changelog (#221)

* Add change log (#226)

* add v1.2.0 changelog

* Updated section to 'Bug Fixes'

* Updated section headings

* Update CHANGELOG-1.2.0.md

* Added missing features and bugs to changelog

* Add change log (#229)

* add v1.2.0 changelog

* Updated section to 'Bug Fixes'

* Updated section headings

* Update CHANGELOG-1.2.0.md

* Added missing features and bugs to changelog

* Updated feature/bug list

* Added known issues

* Removed extra space

* Added changelog entry for release v1.2.1

* Added new bug description to changelog