Bug#1084399: nheko fails to display images from matrix.org (and some other) homservers

[Chris Frey]

I believe this bug is linked with a low level Matrix protocol change,
which also affected the python weechat plugin.

If so, then this commit in the nheko dependency "mtxclient" should fix it:

        Implement MSC3916 (auth for media)
        
https://github.com/Nheko-Reborn/mtxclient/commit/a70753812e3fb832df12b24ee0ee6c70d68060d5

- Chris