Support for Unicode 13

[Delta456]

Unicode 13.0 was released on 10th March 2020 so I think this repo should be updated accordingly.

[psampaz]

GraphemeBreakTest case for 12 and 13 are the same

https://www.unicode.org/Public/12.0.0/ucd/auxiliary/GraphemeBreakTest.txt
https://www.unicode.org/Public/13.0.0/ucd/auxiliary/GraphemeBreakTest.txt
https://www.diffchecker.com/WABrkByc

Uniseg already passes the 12 version tests https://github.com/rivo/uniseg/blob/master/grapheme_test.go#L44, so I suppose it is a matter of updating the text on readme and test file

btw current Go stable version 1.14 supports Unicode 12

[Delta456]

Oh I see didn't know!

Go 1.15 will support Unicode 13 right?

[psampaz]

I have no idea. Try to ask at https://groups.google.com/forum/#!forum/golang-nuts

[Delta456]

I will reopen this when Go officially will support Unicode 13!

[shogo82148]

FYI, Go 1.16 has been released and the unicode package support Unicode 13 now.
https://golang.org/doc/go1.16#unicode