Chore: 1.2.0

# [1.2.0](https://git.rwth-aachen.de/coscine/ts/app-util/compare/v1.1.0...v1.2.0) (2020-01-31)

### New

* Implemented Utility functions for the Sidebar (coscine/issues#603) ([e5451361](https://git.rwth-aachen.de/coscine/ts/app-util/commit/e5451361c0d365e2c83102647264ef44277e5683)), closes [coscine/issues#603](https://git.rwth-aachen.de/coscine/issues/issues/603)