gitedit.plugin: Use the libpeas python3 loader
gitedit.plugin: Use the libpeas python3 loader

Current GNOME (Fedora 25) does not enable the libpeas python loader by
default. Use the python3 loader instead, which is available "out of the
box".

Signed-off-by: Darren Hart (VMware) <38f9eaa30910c40b06f5a60020b1222f2a953801@infradead.org>

dvhart/gedit-git-plugin