[Users] Zimbra development guide `Custom Milter` updated

[Barry de Graaff]

Hello All,
Just an FYI the Custom Milter guide is updated:
https://github.com/Zimbra/custom-milter

 1. Adding required argument /message_from_binary_file/ this has to be
    added because it is required since an update of Python last year.
    https://docs.python.org/3/library/email.parser.html#email.message_from_binary_file
    In a future version a default will be added, but as of now, calling
    message_from_binary_file without policy will throw an error and not
    work
    https://docs.python.org/3/library/email.parser.html#email.parser.BytesFeedParser
 2. Added some code to show how to iterate through attachments and how
    to get attachment filename, type, extension, attachment data and
    attachment object


Kind regards,

*Barry de Graaff*
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