v0.2.8: Middleware and DialAndSendWithContext

[wneessen]

This release adds a middleware concept to the Msg context to allow 3rd parties to extend mail messages with their own code. Thanks to Dhia Gharsallaoui for the PR!

It was also pointed out on Discord that it would be useful to have a DialAndSendWithContext() method, which is also part of this release.

Noteworthy changes

• 3a5f639 implements the middleware concept
• 664aca5 implements the DialAndSendWithContext() method

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This discussion was created from the release v0.2.8: Middleware and DialAndSendWithContext.