**Pull request**

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**How Has This Been Tested?**

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**Checklist**

- [ ] I have read [CONTRIBUTING.md](https://github.com/pdfminer/pdfminer.six/blob/master/CONTRIBUTING.md).
- [ ] I have added a concise human-readable description of the change to [CHANGELOG.md](https://github.com/pdfminer/pdfminer.six/blob/master/CHANGELOG.md).
- [ ] I have tested that this fix is effective or that this feature works.
- [ ] I have added docstrings to newly created methods and classes.
- [ ] I have updated the [README.md](https://github.com/pdfminer/pdfminer.six/blob/master/README.md) and the [readthedocs](https://github.com/pdfminer/pdfminer.six/tree/master/docs/source) documentation. Or verified that this is not necessary.
