Update raven to 6.2.0

[pyup-bot]

There's a new version of raven[flask] available.
You are currently using 6.1.0. I have updated it to 6.2.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

6.2.0

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• [Core] get_frame_locals properly using max_var_size
• [Core] Fixed raven initialization when logging._srcfile is None
• [Core] Fixed import locking to avoid recursion
• [Django] Fixed several issues for Django 1.11 and Django 2.0
• [Django/DRF] Fixed issue with unavailable request data
• [Flask] Added app.logger instrumentation
• [Flask] Added signal on setup_logging
• [ZConfig] Added standalone ZConfig support
• [Celery] Fixed several issues related to Celery

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

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• Commit: e34ddf9
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[pyup-bot]

Closing this in favor of #50