Update prometheus-client to 0.5.0

[pyup-bot]

This PR updates prometheus-client from 0.4.2 to 0.5.0.

Changelog

0.5.0

[ENHANCEMENT] Be more resilient to certain file corruptions (329)
[ENHANCEMENT] Permit subclassing of MetricsHandler (339)
[ENHANCEMENT] Updates based on latest OpenMetrics draft spec discussions (338 346)
[BUGFIX] In multiprocess mode, ensure that metrics initialise to the correct file (346)
[BUGFIX] Avoid re-entrant calls to GC collector's callback (343)

Links

• PyPI: https://pypi.org/project/prometheus-client
• Changelog: https://pyup.io/changelogs/prometheus-client/
• Repo: https://github.com/prometheus/client_python

[pyup-bot]

Closing this in favor of #436