Description: Remove warnings_as_errors from erl_opts
 Fix ftbfs with following error:
Compiling src/cuttlefish_unit.erl failed:
DEBUG: Worker compilation failed: {{error,
  {error,[],
    [["src/cuttlefish_unit.erl:4: export_all flag enabled - all functions will be exported\n"]]}},
    {source,"src/cuttlefish_unit.erl"}}
Author: Nobuhiro Iwamatsu <iwamatsu@debian.org>
Last-Update: 2017-08-19

diff --git a/rebar.config b/rebar.config
index e7d9835..abaa3ce 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,6 +1,6 @@
 {require_otp_vsn, "R16|17|18|19|20"}.
 
-{erl_opts, [warnings_as_errors, {parse_transform, lager_transform}, debug_info, warn_untyped_record]}.
+{erl_opts, [{parse_transform, lager_transform}, debug_info, warn_untyped_record]}.
 
 {eunit_opts, [verbose]}.
 {cover_enabled, true}.
