Implementation of toBeMaxed

The shakespeare benchmark implementation for j.u.s.Stream has this assignment :

https://github.com/akarnokd/akarnokd-misc/blob/78d57288030785bbf482a36213a3a27ef5fde575/src/jmh/java/hu/akarnokd/comparison/scrabble/ShakespearePlaysScrabbleWithStreams.java#L119-L121:

This would probably be more performant as this:

```java
Function toBeMaxed =
word -> IntStream.concat(first3.apply(word), last3.apply(word));
```

From a fairness perspective this should be tried because I notice the other Shakespeare implementations do this with the equivalent of `concat` rather than `flatMap`.

I'll be interested to see the results. By the way do you publish the benchmark results (those nifty graphs) somewhere (other than twitter)?