### Description of the Changes

Please add a detailed description of the change, whether it's an enhancement or a bugfix.
If the PR is related to an open issue please link to it.

### CheckLists

- [ ] changes have been done against master branch, and PR does not conflict
- [ ] new unit / functional tests have been added (whenever applicable)
- [ ] test are passing in local environment
- [ ] Travis tests are passing (or test results are not worse than on master branch :))
- [ ] Docs have been updated