snappy: switch defaultcc to golang-codereviews.

LGTM=dsymonds
R=dsymonds
CC=golang-codereviews
https://codereview.appspot.com/201180043
diff --git a/lib/codereview/codereview.cfg b/lib/codereview/codereview.cfg
index 93b55c0..2801ebf 100644
--- a/lib/codereview/codereview.cfg
+++ b/lib/codereview/codereview.cfg
@@ -1 +1 @@
-defaultcc: golang-dev@googlegroups.com
+defaultcc: golang-codereviews@googlegroups.com