add note about updating profiles in rebar.config

Author: tsloughter

priv/templates/ct-suite.template

@@ -3,4 +3,4 @@
     {name, "myapp", "Name of the Common Test suite to create"}
 ]}.
 {template, "ct_suite.erl", "test/{{name}}_SUITE.erl"}.
-{message, "Run all test suites:\n\n\trebar3 ct\n\nRun individual suite with:\n\n\trebar3 ct --suite=test/{{name}}_SUITE"}.
+{message, "Add this to your rebar.config:\n\n\t{profiles, [{test, [{erl_opts, [nowarn_export_all]}]}]}.\n\nTo run all test suites:\n\n\trebar3 ct\n\nRun individual suite with:\n\n\trebar3 ct --suite=test/{{name}}_SUITE"}.