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Use `getDerivedStateFromProps` more simply (#315)

* Update to React@16.4 and add a test for strict mode

This test is a reproduction for #309 and so is currently failing.

There is some complexity in making it work but it reproduces the problem.

* Don't try and avoid updating state

I'm not sure if this is the best solution for #309, as I am not entirely aware of what this code was trying to do, but it *seemed* like it was trying to avoid touching state too much which doesn't seem super useful as there wasn't any complex calculations involved -- and if there was, memoization would be more useful.

In any case it was triggering problems in strict mode which implies it would have broken in later version of React.

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