remove goldrush

rebar.config

@@ -1,4 +1,3 @@
 {deps, [
-        {getopt, ".*",   {git, "git://github.com/jcomellas/getopt.git", {tag, "v0.8.2"}}},
-        {goldrush, ".*", {git, "https://github.com/metachord/goldrush.git", master}}
+        {getopt, ".*",   {git, "git://github.com/jcomellas/getopt.git", {tag, "v0.8.2"}}}
        ]}.