Pin goldrush to 0.1.7 release

Goldrush 0.1.7 provides for additional comparison operators in traces.

rebar.config

@@ -44,7 +44,7 @@
     nowarn_export_all
 ]}.
 {deps, [
-    {goldrush, ".*", {git, "git://github.com/DeadZen/goldrush.git", {branch, "master"}}}
+    {goldrush, ".*", {git, "git://github.com/DeadZen/goldrush.git", {tag, "0.1.7"}}}
 ]}.
 
 {xref_checks, []}.