Bumbag

Fix
* Missing requirement for docs ([`ec490a3`](https://github.com/estripling/bumbag/commit/ec490a3edeae13cb731ccbcb6eb8bdced9d6e037))

Feature
* Stopwatch as a class ([41](https://github.com/estripling/bumbag/issues/41)) ([`1b33d27`](https://github.com/estripling/bumbag/commit/1b33d27f7bf05554122fa7d2ddef6d4acf019120))

Feature
* Add stopwatch ([39](https://github.com/estripling/bumbag/issues/39)) ([`04599e6`](https://github.com/estripling/bumbag/commit/04599e6216a5db6474ad6b5d0074542c320047c3))

Feature
* Add math-related functions ([38](https://github.com/estripling/bumbag/issues/38)) ([`848b33e`](https://github.com/estripling/bumbag/commit/848b33ee62b719afd7384342175b5e10e1846fd2))
* Add string functions ([37](https://github.com/estripling/bumbag/issues/37)) ([`6506805`](https://github.com/estripling/bumbag/commit/6506805b0e2f22efd9e08dc2134dcb8a99b1d827))
* Use positional- and keyword-only parameters ([36](https://github.com/estripling/bumbag/issues/36)) ([`efeb091`](https://github.com/estripling/bumbag/commit/efeb091f1fa6f670521306d08660a0c237e9588d))

Breaking
* New function signatures and renamed function ([`efeb091`](https://github.com/estripling/bumbag/commit/efeb091f1fa6f670521306d08660a0c237e9588d))

Feature
* **string.py:** Add highlight_string_differences ([`75473b0`](https://github.com/estripling/bumbag/commit/75473b0cb8d9315af1eea630eac4f98380c277aa))

Documentation
* **example.ipynb:** Improve example usage of highlight_string_differences ([`521ff20`](https://github.com/estripling/bumbag/commit/521ff20bf0ba86b7f954a49b1035588e682a8050))
* **README.md:** Add highlight_string_differences as example ([`c611cb6`](https://github.com/estripling/bumbag/commit/c611cb645d8e0a90d374117badd55647156c22ed))

Documentation
* **humantime:** Update docstring examples ([`99ebc12`](https://github.com/estripling/bumbag/commit/99ebc128e46681f8bb2ebbf9e77b51b3a355d632))