Update for Erlang/OTP 20.

Author: okeuday

rebar.config

@@ -1,10 +1,11 @@
 %-*-Mode:erlang;coding:utf-8;tab-width:4;c-basic-offset:4;indent-tabs-mode:()-*-
 % ex: set ft=erlang fenc=utf-8 sts=4 ts=4 sw=4 et nomod:
 
-{require_otp_vsn, "R16|17|18|19"}.
+{require_otp_vsn, "R16|17|18|19|20"}.
 {erl_opts,
- [{platform_define, "^R16", 'ERLANG_OTP_VERSION_16'},
-  {platform_define, "^17.", 'ERLANG_OTP_VERSION_17'},
-  {platform_define, "^18.", 'ERLANG_OTP_VERSION_18'},
-  {platform_define, "^19.", 'ERLANG_OTP_VERSION_19'}]}.
+ [{platform_define, "^R16",  'ERLANG_OTP_VERSION_16'},
+  {platform_define, "^17\.", 'ERLANG_OTP_VERSION_17'},
+  {platform_define, "^18\.", 'ERLANG_OTP_VERSION_18'},
+  {platform_define, "^19\.", 'ERLANG_OTP_VERSION_19'},
+  {platform_define, "^20\.", 'ERLANG_OTP_VERSION_20'}]}.
 {edoc_opts, [{preprocess, true}]}.