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We cannot compare two Func arguments to check if they are equal using
the reflect package. This leads to the following misleading panic:
```go
handler := func(http.ResponseWriter, *http.Request) {}
muxMock.On("HandleFunc", "/", handler)
muxMock.HandleFunc("/", handler)
// panics arguing handler != handler
```
Since we cannot fix this behaviour using reflection, this patch
provides a better panic with a meaningful workaround.
```go
handler := func(http.ResponseWriter, *http.Request) {}
muxMock.On("HandleFunc", "/", handler)
// panics recommending defining the expectatin with:
// AnythingOfType("func(http.ResponseWriter, *http.Request)")
```
Solution following the panic's instructions:
```go
handler := func(http.ResponseWriter, *http.Request) {}
muxMock.On("HandleFunc", "/",
mock.AnythingOfType("func(http.ResponseWriter, *http.Request)"))
muxMock.HandleFunc("/", handler)
```