build(deps): bump pytest-localserver from 0.4.1 to 0.5.0

Bumps [pytest-localserver](https://bitbucket.org/pytest-dev/pytest-localserver) from 0.4.1 to 0.5.0.
- [Changelog](https://bitbucket.org/pytest-dev/pytest-localserver/src/default/CHANGES)
- [Commits](https://bitbucket.org/pytest-dev/pytest-localserver/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

test-requirements.txt

@@ -2,7 +2,7 @@ pytest==3.7.3
 pytest-forked==1.1.0
 tox==3.7.0
 Werkzeug==0.15.5
-pytest-localserver==0.4.1
+pytest-localserver==0.5.0
 pytest-cov==2.6.0
 gevent
 eventlet