Update spec/packets_spec.cr

Co-authored-by: Jon Börjesson <jon@spuun.se>

Author: snichme

spec/packets_spec.cr

@@ -177,7 +177,8 @@ describe MQTT::Protocol::Packet do
           connect = connect.should be_a MQTT::Protocol::Connect
           connect.username.should eq username
           connect.password.should eq password
-          connect.will.try(&.topic).should eq wtopic
+         will = connect.will.should_not be_nil
+         will.topic.should eq wtopic
         end
 
         it "supports MQTT 3.1 protocol" do