Update pluggy to 0.9.0

[pyup-bot]

This PR updates pluggy from 0.8.1 to 0.9.0.

Changelog

0.9.0

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

Features
--------

- `189 <https://github.com/pytest-dev/pluggy/issues/189>`_: ``PluginManager.load_setuptools_entrypoints`` now accepts a ``name`` parameter that when given will
load only entry points with that name.

``PluginManager.load_setuptools_entrypoints`` also now returns the number of plugins loaded by the
call, as opposed to the number of all plugins loaded by all calls to this method.



Bug Fixes
---------

- `187 <https://github.com/pytest-dev/pluggy/issues/187>`_: Fix internal ``varnames`` function for PyPy3.

Links

• PyPI: https://pypi.org/project/pluggy
• Changelog: https://pyup.io/changelogs/pluggy/
• Repo: https://github.com/pytest-dev/pluggy

[codecov]

Codecov Report

Merging #408 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #408   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files           8        8           
  Lines         702      702           
  Branches      125      125           
=======================================
  Hits          692      692           
  Misses          2        2           
  Partials        8        8

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[codecov]

Codecov Report

Merging #408 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #408   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files           8        8           
  Lines         702      702           
  Branches      125      125           
=======================================
  Hits          692      692           
  Misses          2        2           
  Partials        8        8

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 52b7d72...8b9ce43. Read the comment docs.