Remove outdated sentence from README (#7311)

Unicode property escapes are now part of ECMAScript proper.

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Mathias Bynens 2018-02-01 14:27:13 -08:00 committed by GitHub
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Compile [Unicode property escapes](https://github.com/mathiasbynens/regexpu-core/blob/master/property-escapes.md) (`\p{…}` and `\P{…}`) in Unicode regular expressions to ES5 or ES6 that works in todays environments.
**Note:** the Unicode property escape syntax is non-standard and may or may not reflect what eventually gets specified.
[Heres an online demo.](https://mothereff.in/regexpu#input=var+regex+%3D+/%5Cp%7BScript_Extensions%3DGreek%7D/u%3B&unicodePropertyEscape=1)
## Installation