## Types of changes

<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->

* [ ] Bug fix (non-breaking change which fixes an issue)
* [ ] New feature (non-breaking change which adds functionality)
* [ ] Breaking change (fix or feature that would cause existing functionality to change)
* [ ] I have read the **CONTRIBUTING** document.
* [ ] `make ci` passes on my machine.
* [ ] My change requires a change to the documentation.
* [ ] I have updated the documentation accordingly.
* [ ] I have added tests to cover my changes.