Remove debug_info, rebar sets this automatically

rebar.config

@@ -1,5 +1,4 @@
 %% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
 %% ex: ts=4 sw=4 ft=erlang et
 
-{erl_opts, [debug_info]}.
 {cover_enabled, true}.