Add support of Erlang 20

Author: manifest

rebar.config

@@ -1,4 +1,4 @@
-{require_otp_vsn, "R15|R16|17|18|19"}.
+{require_otp_vsn, "R15|R16|17|18|19|20"}.
 
 {cover_enabled, true}.
 
@@ -9,7 +9,7 @@
     warnings_as_errors,
     {platform_define, "^[0-9]+", namespaced_types},
     {platform_define, "(?=^[0-9]+)(?!^17)", deprecated_now},
-    {platform_define, "^19", deprecated_19}
+    {platform_define, "(?!^19)(?!^20)", deprecated_19}
 ]}.
 
 {deps, [