tag go1.3rc2

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/101270043
diff --git a/.hgtags b/.hgtags
index ccc3439..8d9e6e0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -130,3 +130,4 @@
 f8b50ad4cac4d4c4ecf48324b4f512f65e82cc1c go1.3beta1
 9e1652c32289c164126b6171f024afad5665fc9e go1.3beta2
 9d5451df4e53acc58a848005b7ec3a24c4b6050c go1.3rc1
+3f66a43d5180052e2e1e38d979d1aa5ad05b21f9 go1.3rc2