Update snakeviz to 2.2.0

[pyup-bot]

This PR updates snakeviz from 1.0.0 to 2.2.0.

Changelog

2.2.0

===================

* Add configuration options for the %snakeviz magic
(thanks dabacon in 174)
* Drop explicit support for EOL Pythons

2.1.2

===================

* Add dark theme (thanks martinbagic in 173)
* Add python-requires metadata (thanks matthewfeickert in 188)

2.1.1

===================

* Improved styling for snakeviz dropdowns (thanks dannysepler in 166)
* Improved performance of the icicle chart (thanks dannysepler in 165)

2.1.0

===================

* Fix SnakeViz for Windows and Python 3.8 (thanks daniel-butler in 139).
* Adds helpful title text to the stats table (thanks PeterJCLaw in 142).
* Fixes a Python 2.7 compatibility issue with directory listing
(thanks joranbeasley in 144).

2.0.1

===================

* Fixes to SnakeViz embedding so that it doesn't assume jQuery is available
when configuring the SnakeViz iframe.
* Add a set of default ports attempted when starting SnakeViz for
embedding within Jupyter (Thanks andyljones in 125!).

2.0.0

===================

* ``%snakeviz`` IPython magic command now embeds the snakeviz visualization
within a Jupyter Notebook when invoked from the notebook. This is the
default behavior when it's used within a Notebook.
(Thanks yjmade via 110!)
* Improved error message when ``pstats.Stats`` can't load a profile.

Links

• PyPI: https://pypi.org/project/snakeviz
• Changelog: https://pyup.io/changelogs/snakeviz/