README.md in unicode-x-14.0.1 vs README.md in unicode-x-15.0.0

- old
+ new

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-# Unicode::X 14 [![[version]](https://badge.fury.io/rb/unicode-x.svg)](https://badge.fury.io/rb/unicode-x)
+# Unicode::X 15 [![[version]](https://badge.fury.io/rb/unicode-x.svg)](https://badge.fury.io/rb/unicode-x)
 
 **Unicode X** is a collection of choose-what-you-need style Unicode libraries for Ruby.
 
 ## Libraries
 