Without this patch, dependencies would be downloaded and compiled
by rebar at build time.

Signed-off-by: Christophe Romain <cromain@process-one.net>

diff --git a/rebar.config b/rebar.config
--- a/rebar.config	2017-11-30 14:24:52.348695123 +0100
+++ b/rebar.config	2017-11-30 14:35:11.816407195 +0100
@@ -29,10 +29,6 @@

 {port_specs, [{"priv/lib/jid.so", ["c_src/jid.c"]}]}.

-{deps, [{fast_xml, ".*", {git, "https://github.com/processone/fast_xml", {tag, "1.1.25"}}},
-        {stringprep, ".*", {git, "https://github.com/processone/stringprep", {tag, "1.0.10"}}},
-        {p1_utils, ".*", {git, "https://github.com/processone/p1_utils", {tag, "1.0.10"}}}]}.
-
 {clean_files, ["c_src/jid.gcda", "c_src/jid.gcno"]}.

 {cover_enabled, true}.