Xocto

- Added numpy as a dependency [52](https://github.com/octoenergy/xocto/pull/52)

- New function `pact_testing.get_git_branch_name()` for getting current git branch name [40](https://github.com/octoenergy/xocto/pull/40)
- New tracing module [46](https://github.com/octoenergy/xocto/pull/46)
- Updated dependencies so openpyxl, pandas, python-dateutil, python-magic, pytz, structlog, and xlrd are installed not just in dev [48](https://github.com/octoenergy/xocto/pull/48)
- Add pyarrow dependency [44](https://github.com/octoenergy/xocto/pull/44)

Includes:

- Many type annotations added ([33](https://github.com/octoenergy/xocto/pull/33)), breaking changes for some users means releasing this as a major version upgrade.
- Type annotation for `get_finite_datetime_ranges_from_timestamps` updated ([37](https://github.com/octoenergy/xocto/pull/37)).
- Added the `localtime` function `period_exceeds_one_year` for determining whether a datetime period
exceeds one year ([41](https://github.com/octoenergy/xocto/pull/41)).

Includes:

- Many type annotations added ([33](https://github.com/octoenergy/xocto/pull/33)).
- Type annotation for `get_finite_datetime_ranges_from_timestamps` updated ([37](https://github.com/octoenergy/xocto/pull/37)).
- Added the `localtime` function `period_exceeds_one_year` for determining whether a datetime period
exceeds one year ([41](https://github.com/octoenergy/xocto/pull/41)).

Includes:

- Addition of get_last_modified function ([32](https://github.com/octoenergy/xocto/pull/32))
- Update project dependencies ([34](https://github.com/octoenergy/xocto/pull/34))

Includes:

- A small fix to publish the storage module in setup.py
- README update