This release aims at making the fitting feature more generic by allowing
other forms of likelihood conditioning and other metrics than the return
level in the confidence interval computation.
Breaking changes
* Remove `simulations` and `stopping_times` modules
* Removed `Likelihood.return_level`
* Move `visualisation_utils` to their own subpackage
* Rename `conditioning_method` argument to `penalty`
* Rename `profile_likelihood` method to `fit_instance`
New features
* New method `Likelihood.confidence_interval` with the `metric` argument
to control which value to estimate
Other
* Add section to README.rst about parameter profiling
* Add pre-commit hooks
* Fix README.rst directives