Bump pip-tools from 5.1.2 to 5.2.0 (#1227)

Bump pip-tools from 5.1.2 to 5.2.0 (#1227)

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.1.2 to 5.2.0.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jazzband/pip-tools/compare/5.1.2...5.2.0)

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