Chore: 1.5.0

# [1.5.0](https://git.rwth-aachen.de/coscine/api/sts/compare/v1.4.0...v1.5.0) (2019-11-26)

### New

* Implement very basic static login process for IE8 and lower (coscine/issues#463) ([127aa2fe](https://git.rwth-aachen.de/coscine/api/sts/commit/127aa2fe6d4f114f9caab7e3a73621eeb3dcc906)), closes [coscine/issues#463](https://git.rwth-aachen.de/coscine/issues/issues/463)