**New features**
- Prevent ``attachment`` attributes to be modified manually (fixes Kinto/kinto-attachment83)
**Bug fixes**
- Fix crash when the file is not uploaded using ``attachment`` field name (fixes Kinto/kinto-attachment57)
- Fix crash when the multipart content-type is invalid.
- Prevent crash when filename is not provided (fixes Kinto/kinto-attachment81)
- Update the call to the Record resource to use named attributes. (Kinto/kinto-attachment97)
- Show detailed error when data is not posted with multipart content-type.
- Fix crash when submitted data is not valid JSON (fixes Kinto/kinto-attachment104)