Update rollbar to 0.13.9

[pyup-bot]

There's a new version of rollbar available.
You are currently using 0.13.2. I have updated it to 0.13.9

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

Changelog

0.13.9

• Change _check_config() to deal with agent handler. See 147
• Fix settings values not being booleans in Pyramid. See 150

0.13.8

• Fix regression from 0.13.7. See 141

0.13.7

• Update Django middleware to support Django 1.10+. See 138

0.13.6

• Fixed a referenced before assignment in the failsafe. See 136

0.13.5

• Fixed record message formatting issues breaking the log handler's history. See 135

0.13.4

• Fixed failsafe handling for payloads that are too large. See 133

0.13.3

• Improved handling of Enums. See 121

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

Happy merging! 🤖