Update schedule

Author: coke

misc/perl6advent-2017/schedule

@@ -24,7 +24,7 @@ exists: https://github.com/zoffixznet/perl6-Acme-Advent-Highlighter
 19: koorchik: "Language Independent Validation Rules (LIVR) for Perl6"
 20: vendethiel: "Advancements in macrotechnologies"
 21: scimon: "Sudoku solving with Sets and Junctions"
-22: Coke: Surely he'll think of something before then.
+22: Coke: "Solving a Rubik's Cube"
 23: AlexDaniel: “The Wonders of Perl 6 Golf”
 24: lizmat: Features of Perl 6.d
 25: ramiroencinas: "Concurrent HTTP Perl6 implementation and the script’s point of view"