[recover-include] Recover opt that was incorreclty removed in #37 (#40)

Author: Brujo Benavides

rebar.config

@@ -12,7 +12,8 @@
   warn_export_vars,
   warn_exported_vars,
   warnings_as_errors,
-  debug_info]}.
+  debug_info,
+  {i, "./_build/default/plugins/gpb/include"}]}.
 
 {deps, [{jiffy, "1.0.8"}, {erlexec, "1.10.9"}]}.