### Pull Request check-list

_Please make sure to review and check all of these items:_

- [ ] Does `$ tox` pass with this change (including linting)?
- [ ] Does travis tests pass with this change (enable it first in your forked repo and wait for the travis build to finish)?
- [ ] Is the new or changed code fully tested?
- [ ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

_NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open._

### Description of change

_Please provide a description of the change here._
