Fbm

~~~~~~~~~~~~~~~~~

* Drop support for Python 2

* Remove usage of numpy matrix objects (to be deprecated in numpy)

* Replace pipenv with poetry for dependency management.

* Implement black code formatting

~~~~~~~~~~~~~~~~~

* Added multifractional Brownian motion class (MBM).

* Added ``__version__`` and other metadata at module level.

* Start using pipenv for dependency management.

* Changed testing framework to pytest.

~~~~~~~~~~~~~~~~~

* Fixed a bug where changing the method would only change the string but not
the actual function called.

* Better behavior when ``daviesharte`` fails. Now switches methods for future
realizations and sets eigenvals to ``None``.

* Added testing for ``daviesharte`` to ``hosking`` fallback.

* Added ``__str__`` and ``__repr__`` functions.

* Changed from ``distutils`` to ``setuptools``.

* Added wheel support.

* Added ``HISTORY.rst``.

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* Turned fbm.py into an actual python package available on pypi.

* ``FBM`` class for monte carlo simulating multiple realizations of fBm with
the same parameters.

* ``fbm``, ``fgn``, ``times`` functions for one-off realizations.