fix avz version

rebar.config

@@ -13,5 +13,5 @@
     {mad,    ".*", {git, "git://github.com/synrc/mad",          {tag, "0.8"}   }},
     {rest,   ".*", {git, "git://github.com/synrc/rest",         {tag, "1.5.0"} }},
     {kvs,    ".*", {git, "git://github.com/synrc/kvs",          {tag, "1.5.0"} }},
-    {avz,    ".*", {git, "git://github.com/synrc/avz",          {tag, "1.5.0"} }}
+    {avz,    ".*", {git, "git://github.com/synrc/avz",          {tag, "1.4.0"} }}
 ]}.