Remove Erlang R16 support
Client: erl
Patch: Sergey Yelin

This closes #2354
diff --git a/lib/erl/rebar.config b/lib/erl/rebar.config
index ab2c255..b5258a2 100644
--- a/lib/erl/rebar.config
+++ b/lib/erl/rebar.config
@@ -1,4 +1,4 @@
-{erl_opts, [{platform_define, "^R.*", otp16_or_less}, debug_info]}.
+{erl_opts, [debug_info]}.
 
 {profiles, [
     {test, [