Update uritemplate to 4.2.0

[pyup-bot]

This PR updates uritemplate from 3.0.0 to 4.2.0.

Changelog

4.2.0

------------------

- Drop support for Python 3.8
- Fix bug where already url-encoded values were further escaped and
encoded (See https://github.com/python-hyper/uritemplate/issues/99)
- Refactor ``uritemplate/variable.py`` to enable fixing the
aforementioned bug.

4.1.1

------------------

- Fix setup.cfg metadata to reflect lack of support for Python 2 as desired in
4.0

4.1.0

------------------

- Add type annotations to uritemplate and distribute them for others to use
- Update to a modern documentation theme as well

4.0.0

------------------

- Drop support for Python 2.7, 3.4, and 3.5
- Better support number-like types as values for variables in a template

3.0.2

------------------

- Fix meta-package requirements.

3.0.1

------------------

- Deprecate in favor of uritemplate. This package is now a metapackage that
depends on uritemplate.

Links

• PyPI: https://pypi.org/project/uritemplate
• Changelog: https://data.safetycli.com/changelogs/uritemplate/
• Docs: https://uritemplate.readthedocs.org