UPGRADING

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#  NOTE FOR UPGRADING FROM 4.3.0 OR EARLIER       #
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Paperclip is now compatible with aws-sdk >= 2.0.0.

If you are using S3 storage, aws-sdk >= 2.0.0 requires you to make a few small
changes:

* You must set the `s3_region`
* If you are explicitly setting permissions anywhere, such as in an initializer,
  note that the format of the permissions changed from using an underscore to
  using a hyphen. For example, `:public_read` needs to be changed to
  `public-read`.

If you want to continue using an earlier version of aws-sdk, replace
 aws-sdk with aws-sdk-v1 in your Gemfile.

If both are in your Gemfile, paperclip will use aws-sdk v2.