add exprecs compile_transform form isup, m2ua and mtp3
diff --git a/src/mtp3_codec.erl b/src/mtp3_codec.erl
index 4912b54..0ab39ab 100644
--- a/src/mtp3_codec.erl
+++ b/src/mtp3_codec.erl
@@ -23,6 +23,9 @@
-export([parse_mtp3_msg/1, encode_mtp3_msg/1]).
+-compile({parse_transform, exprecs}).
+-export_records([mtp3_routing_label, mtp3_msg]).
+
% Parse standard routing label according to Section 2.2 of ITU-T Q.704
parse_mtp3_routing_label(_, LabelBin) when is_binary(LabelBin) ->
<<Sls:4/big, Opc:14/big, Dpc:14/big, Remain/binary>> = LabelBin,