v0.2.3: File output support

[wneessen]

This release adds support for writing mail messages directly into a file. We've added two methods:

• Msg.WriteToTempFile() which will automatically generated a .eml file localted in the OS' temporary directory
• Msg.WriteToFile() which takes a filename as argument and stores the output of the mail message into that file

If the message output is stored with a .eml file extension, the mail is usually detected as such and can be directly opened with the OS' MUA. This has been tested with Mail.App, Thunderbird and Outlook.

Noteworthy changes

• Store generated mail as file #18 adds the support for the file output
• bc9b39f switched the go.mod minimum version to 1.16, since we can fully support this

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This discussion was created from the release v0.2.3: File output support.