v0.3.1: Access to message attachments

This release introduces a couple of new methods on the Msg, which will help the Msg.Middleware to deal with Msg attachments.

To get the Msg attachments, we can now use the Msg.GetAttachments() methods to get the list of currently assigned attachments to the Msg.

To set the Msg attachments, we can now use the Msg.SetAttachments() methods to set a list of *File as Msg attachments.

What's Changed

• Expose Msg attachments fields by @dhia-gharsallaoui in #63 (Thanks to Dhia Gharsallaoui for the PR!)

Full Changelog: v0.3.0...v0.3.1