Kinto-emailer

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Since version 2.2.0, we use `Github releases <https://github.com/Kinto/kinto-emailer/releases>`_ and autogenerated changelogs.

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**New features**

- Add ability to use settings values in placeholders (294).
For example: ``"subject": "Email from {settings[project_name]}"``

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- Remove template variable validation

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**New features**

- Allow regexp in filters values when selecting events (88)

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**Internal changes**

- Get rid of ``six``

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**Bug fixes**

- Don't block on Pyramid 1.8 anymore. (46)