Linux AppImage can't launch as-is

[Fishbowler]

$ ./linux-Maestro-Studio-x86_64.AppImage 
[10475:0920/170926.186902:FATAL:setuid_sandbox_host.cc(163)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_linux-YKW74F/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap (core dumped)

As it's Electron, we need --no-sandbox in order to launch this.

I don't think there's an alternative, so just needs putting this in the docs.