rebar.config: Update uart to version 1.0
rebar.config: Update uart to version 1.0

There's now a release tag that's more recent than 2014, hooray :-)

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

aszlig/rayactor