add full addon name as slash command

diff --git a/ArtifactMenu.lua b/ArtifactMenu.lua
index 057f819..e4ad3b6 100644
--- a/ArtifactMenu.lua
+++ b/ArtifactMenu.lua
@@ -1,4 +1,5 @@
-LASH_ARTIFACTMENU1, SLASH_ARTIFACTMENU2 = '/artifact', '/am';
+SLASH_ARTIFACTMENU1, SLASH_ARTIFACTMENU2 = '/artifact', '/am';
+SLASH_ARTIFACTMENU3 = "/artifactmenu";

 local function openWeaponSockets()
     SocketInventoryItem(16);