move to rebar3 and bump version

rebar.config.script

@@ -1,42 +0,0 @@
-%% Merge the list values in `ToAdd' into the list found at key `Key'
-%% in proplist `C'. Don't duplicate items. New Items are added to the
-%% front of existing items. It is an error if the value at `Key' is
-%% not a list in `C'.
-MergeConfig = fun({Key, ToAdd}, C) ->
-                      case lists:keyfind(Key, 1, C) of
-                          false ->
-                              lists:keystore(Key, 1, C, {Key, ToAdd});
-                          {Key, List} when is_list(List) ->
-                              %% remove items in ToAdd already in List
-                              ToAdd1 = [ I || I <- ToAdd, not lists:member(I, List) ],
-                              lists:keystore(Key, 1, C, {Key, ToAdd1 ++ List })
-                      end
-              end.
-
-{match, [ErtsNumber]} = re:run(erlang:system_info(otp_release), "(\\d+)", [{capture, [0], list}]),
-ErtsVsn = erlang:list_to_integer(ErtsNumber),
-AddErlOpts = if
-                 ErtsVsn >= 15 ->
-                     [{d, have_callback_support}];
-                 true ->
-                     []
-             end,
-
-DevOnlyDeps = [{neotoma, "",
-                {git, "https://github.com/seancribbs/neotoma.git", {branch, master}}},
-               {proper, "",
-                {git, "https://github.com/bkearns/proper.git", {branch, master}}}],
-
-Config1 = MergeConfig({erl_opts, AddErlOpts}, CONFIG),
-
-ConfigPath = filename:dirname(SCRIPT),
-DevMarker = filename:join([ConfigPath, ".DEV_MODE"]),
-case filelib:is_file(DevMarker) of
-    true ->
-        lists:foldl(MergeConfig, Config1,
-                    [{deps, DevOnlyDeps},
-                     {erl_opts, [{d, 'DEV_ONLY'}]}]);
-    false ->
-        Config1
-end.
-