No need to change it for me; I didn't actually remove the code for compatibility with Industrial Revolution 2; I just added a new condition for when Industrial Revolution 3 is used.
I'm not sure if there is any reason to still use IR2, but it seemed best to leave the condition in place, just in case any stragglers are still playing with IR2 (or if people prefer IR2 to IR3, for whatever reason)
EDIT: Oh, I did accidentally add IR3 as a hidden optional dependency, instead of making it visible like the rest. I can fix that later.