bump major version for incompatible API update

diff --git a/ArtifactMenu.toc b/ArtifactMenu.toc
index c344059..e0f0236 100644
--- a/ArtifactMenu.toc
+++ b/ArtifactMenu.toc
@@ -1,7 +1,7 @@
 ## Interface: 70000
 ## Title: ArtifactMenu
 ## Author: Kevin Gilbert (kaygil)
-## Version: 1.1.0
+## Version: 2.0.0

 libs/LibStub.lua
 libs/CallbackHandler-1.0.lua