Ligotimegps

Bug fixes (including packaging, unit test, and documentation updates):

- [4] fixed issues with CI build
- [5] fixed issues with coveralls
- [6] improved `setup.py`

For a complete display of everything that has changed since the last release, see https://github.com/gwpy/ligotimegps/compare/v1.2.1...v1.2.2.

Bug fixes (including packaging, unit test, and documentation updates):

- [3] fixed comparisons to infinity

Release notes

- [2] reworked test suite to use pytest

Release Notes

- [1] improved parsing of strings, now accepts engineering/scientific formats, e.g. `1e9`