erlang 21+ is required

ericb-summit · ericb-summit · commit 4d1ca0544df9 · 2019-03-18T16:20:51.000-04:00
Unit tests currently fail on erlang &lt; 21 due
to failure coming in from gun.
diff --git a/rebar.config b/rebar.config
@@ -27,3 +27,4 @@
 ]}.
 
 {profiles, [{test, [{deps, [meck]}]}]}.
+{minimum_otp_vsn, "21.0"}.
