Update NEWS file

NEWS

 Unreleased:
 
+* Bug fix: Uploading file with unicode file name now won't raise an error when
+  logging in the AWS is turned on.
+* Bug fix: Task "paperclip:refresh:missing_styles" now work correctly
+* Bug fix: Handle the case when :restricted_characters is nil
+* Bug fix: Don't delete all the existing styles if we reprocess
+* Bug fix: Content type is now ensured to not having a new line character
+* API CHANGE: Non-Rails usage should include Paperclip::Glue directly
+
+  `Paperclip::Railtie` was intended to be used with Ruby on Rails only. If you're
+  using Paperclip without Rails, you should include `Paperclip::Glue` into
+  `ActiveRecord::Base` instead of requiring `paperclip/railtie`:
+
+      ActiveRecord::Base.send :include, Paperclip::Glue
+
 * Bug fix: AttachmentContentTypeValidator now allow you to specify :allow_blank/:allow_nil
 * Bug fix: Make sure content type always a String.
 * Bug fix: Fix attachment.reprocess! when using storage providers fog and s3.