Kinto-attachment

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**Bug fixes**

- Fix invalid request when attaching a file on non UUID record id (fixes 122)

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**Bug fixes**

- Fixes compatibility with Kinto 5.3 (fixes 120)

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- Expose the gzipped settings value in the capability (117)

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**Bug fixes**

- Make kinto-attachment compatible with both cornice 1.x and 2.x (115)

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**Breaking change**

- Remove the ``base_url`` from the public settings because the
accurate value is in the capability.

**Protocol**

- Add the plugin version in the capability.

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**New features**

- Prevent ``attachment`` attributes to be modified manually (fixes 83)

**Bug fixes**

- Fix crash when the file is not uploaded using ``attachment`` field name (fixes 57)
- Fix crash when the multipart content-type is invalid.
- Prevent crash when filename is not provided (fixes 81)
- Update the call to the Record resource to use named attributes. (97)
- Show detailed error when data is not posted with multipart content-type.
- Fix crash when submitted data is not valid JSON (fixes 104)

**Internal changes**

- Remove hard-coded CORS setup (fixes 59)