Added

• go-gomail#40: Adds Dialer.LocalName field to allow specifying the hostname
  sent with SMTP's HELO command.
• go-gomail#47: Message.SetBody, Message.AddAlternative, and
  Message.AddAlternativeWriter allow specifying the encoding of message parts.
• Dialer.Dial's returned SendCloser automatically redials after a timeout.
• go-gomail#55, go-gomail#56: Adds Rename to allow specifying filename
  of an attachment.
• go-gomail#100: Exports NetDialTimeout to allow setting a custom dialer.
• go-gomail#70: Adds Dialer.Timeout field to allow specifying a timeout for
  dials, reads, and writes.

Changed

• go-gomail#52: Dialer.Dial automatically uses CRAM-MD5 when available.
• Dialer.Dial specifies a default timeout of 10 seconds.
• Gomail is forked from https://github.com/go-gomail/gomail/ to
  https://github.com/go-mail/mail/.

Deprecated

• go-gomail#52: NewPlainDialer is deprecated in favor of NewDialer.

Fixed

• go-gomail#41, go-gomail#42: Fixes a panic when a Message contains a
  nil header.
• go-gomail#44: Fixes AddAlternativeWriter replacing the message body instead
  of adding a body part.
• go-gomail#53: Folds long header lines for RFC 2047 compliance.
• go-gomail#54: Fixes Message.FormatAddress when name is blank.