This adds a peek member function to grapheme.Iterator.
Tests are in unicode-test because I couldn't figure out how to run them in grapheme.zig. This also updates unicode-test to not use std.mem.split which is now deprecated on Zig master branch.
This adds a `peek` member function to `grapheme.Iterator`.
Tests are in `unicode-test` because I couldn't figure out how to run them in `grapheme.zig`. This also updates `unicode-test` to not use `std.mem.split` which is now deprecated on Zig master branch.