Bad XEP-0474 version in .doap file and new XEP-0474 version

[Neustradamus]

It is specified that XEP-0474 0.4.0 is supported since 1.8.0 but there is no 0.4.0, it was 0.3.0:

• https://github.com/processone/xmpp/blob/master/xmpp.doap#L743
• https://github.com/processone/xmpp/issues/79
• https://github.com/processone/xmpp/commit/01e41061e6adb8569ed595a2b0701a2b91db83b0

It was 0.3.0 at the commit moment:

• https://xmpp.org/extensions/xep-0474.html#appendix-revs

Now there is a 0.3.1 (2024-09-11):

• https://www5.aptest.com/standards/htmldiff/htmldiff.pl?oldfile=https://xmpp.org/extensions/attic/xep-0474-0.3.0.html&newfile=https://xmpp.org/extensions/attic/xep-0474-0.3.1.html

[Neustradamus]

@badlop: Thanks for your commit!