README: remove trolling

I guess this qualifies as trolling. It's becoming increasingly clear
that Microsoft will not be able to deliver on this promise, at least not
in the way they made it seem at first. I'm not sure if Microsoft was the
one who did the trolling, or me. I actually expected that we'd get full
GUI integration of Linux applications including accelerated graphics,
but it was always clear that it wasn't going to work as well as
natively.

In any case, there is no need to frighten any users. The time when you
can run only "Windows Store Apps" on Windows (== the end for mpv and
many other applications on Windows) will come soon enough.

The "faster than native" statement is based on other people's real
experience of software running faster in Linux VMs than native windows
ports, by the way.

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