Update rebar.config

rebar.config

@@ -21,7 +21,7 @@
 
 {shell, [{apps, [jsone]}]}.
 
-{dialyzer, [{warnings, [error_handling, race_conditions, unmatched_returns, unknown, no_improper_lists]}]}.
+{dialyzer, [{warnings, [error_handling, unmatched_returns, unknown, no_improper_lists]}]}.
 
 {profiles, [{native, [{erl_opts, [{d, 'ENABLE_HIPE'}]}]},
             {edown, [{edoc_opts, [{doclet, edown_doclet}]}, {deps, [edown]}]}]}.