Add myself to the calendar

I took the last slot due to tuits and theme (snow on Christmas Eve, no
matter where you live). The post I displaced explicitly told me to remove
itself from the listing.

Author: ab5tract

misc/perl6advent-2016/schedule

@@ -22,4 +22,4 @@ Please add your topic and name after each day that you plan to take.
 21 nkh: Data Dumping, a modules journey from Perl 5 to Perl 6
 22 SmokeMachine: Generative testing
 23 AlexDaniel: "Everything is either wrong or less than awesome"
-24 [claim this spot if you want to write; remove this post] Zoffix: "How to Make, Use, and Abuse Perl 6 Subsets"
+24 ab5tract: Make it snow.