rebar.config: Update relaxed dependency versions for Rebar3

Author: badlop

rebar.config

@@ -22,7 +22,7 @@
 
 {erl_opts, [debug_info, {src_dirs, ["src"]}, {i, "include"}]}.
 
-{deps, [{xmpp, ".*", {git, "https://github.com/processone/xmpp", {tag, "1.8.1"}}}]}.
+{deps, [{xmpp, "~> 1.8.0", {git, "https://github.com/processone/xmpp", {tag, "1.8.1"}}}]}.
 
 {cover_enabled, true}.
 {cover_export_enabled, true}.