Add to Readme: the order in which middleware is defined matters

This is a suggestion rather than a bug or problem.

The readme should point out that the order in which middleware is defined also controls the order in which it is executed. It is also possible to call a middleware more than once.

I don't know if this is intentional, but it cost me some nerves :) I struggled with sanitation and validation for example. But there are some great options as well.

I haven't tried it yet, but this way you could probably control the reconnect middleware better because you get more parameters in other handlers. There were some questions here about that.

So long story short, if its by intentional I think it should be mentioned in the docu as well.