fixed another ref

diff --git a/core.lua b/core.lua
index 2dc658b..8ab3464 100644
--- a/core.lua
+++ b/core.lua
@@ -121,7 +121,7 @@ addon.optionsFrame = {}
 local MissingLibraries
 do
 	local REQUIRED_LIBS = {
-		"AceLocale-3.1",
+		"AceLocale-3.0",
 		"LibBabble-Boss-3.0",
 		"LibBabble-Faction-3.0",
 		"LibBabble-Zone-3.0",