[announce/2015.04.md] add list of contributors

docs/announce/2015.04.md

@@ -26,7 +26,11 @@ Parrot, the Perl 6 test suite, MoarVM and the specification.
 
 The following people contributed to this release:
 
-TBD
+Jonathan Worthington, Larry Wall, Elizabeth Mattijsen, Tobias Leich, Pepe
+Schwarz, Moritz Lenz, Will "Coke" Coleda, Carl Mäsak, Alexander Moquin,
+raydiak, Brent Laabs, Christian Bartolomäus, Timo Paulssen, Jonathan Stowe,
+Stefan Seifert, Jonathan Scott Duff, Rob Hoelz, Edwin Steiner, Geoffrey
+Broadwell, nwc10, eli-se, lucasb, RabidGravy
 
 If you would like to contribute, see <http://rakudo.org/how-to-help>,
 ask on the <perl6-compiler@perl.org> mailing list, or ask on IRC #perl6