Added private.game_versions table

diff --git a/Constants.lua b/Constants.lua
index 960c88e..097bfdf 100644
--- a/Constants.lua
+++ b/Constants.lua
@@ -44,6 +44,12 @@ private.item_quality_names = {
 	[6] = "ARTIFACT",
 }

+private.game_versions = {
+	["ORIG"] = 1,
+	[ "TBC"] = 2,
+	["WOTLK"] = 3,
+}
+
 -------------------------------------------------------------------------------
 -- Filter flags.
 -------------------------------------------------------------------------------