Vulcan-py

Main Changes
* Build lockfiles asynchronously, improving performance for projects with several extras
* Support [PEP660](https://www.python.org/dev/peps/pep-0660/)

What's Changed
* raise an error when lockfile is missing, rather than a warning by Thirdegree in https://github.com/optiver/vulcan-py/pull/30
* async builder logic by Thirdegree in https://github.com/optiver/vulcan-py/pull/33
* support PEP660 pip install --editable by Thirdegree in https://github.com/optiver/vulcan-py/pull/19
* bump version to 1.1.0 by Thirdegree in https://github.com/optiver/vulcan-py/pull/34


**Full Changelog**: https://github.com/optiver/vulcan-py/compare/v1.0.3...v1.1.0

Improve behavior of `lock` by making it a bit smarter about what python version it should use when in a virtualenv.

This release fixes issues with windows compatibility. Vulcan should now be fully cross-platform compatible.

Also fixing issues with release flow.

This release fixes issues with windows compatibility. Vulcan should now be fully cross-platform compatible.