Update rebar.config

rebar.config

@@ -53,6 +53,8 @@
    ]},
   {test,
    [
-    {plugins, [rebar_covertool]}
+    %% FIXME: Uncomment the below line when rebar_covertool-v1.3.0 is released
+    %% {plugins, [rebar_covertool]}
+    {plugins, [{rebar_covertool, {git, "https://github.com/covertool/covertool.git", {branch, "master"}}}]}
    ]}
  ]}.