style(rubocop): Style/TrailingCommaInArrayLiteral

spec/lib/postal/legacy_config_source_spec.rb

@@ -73,7 +73,7 @@ module Postal
       it "returns a value for postal.smtp_relays" do
         expect(config.postal.smtp_relays).to eq [
           { "host" => "1.2.3.4", "port" => 25, "ssl_mode" => "Auto" },
-          { "host" => "2.2.2.2", "port" => 2525, "ssl_mode" => "None" }
+          { "host" => "2.2.2.2", "port" => 2525, "ssl_mode" => "None" },
         ]
       end
     end