(req) please add an option to enable the checkout page as well

Hi there,

First of all, great work!

Second, I’m using the checkout and cart page together (apparently my niche likes the fact that they can change quantity in the checkout), anyways:

After every update I have to tweak the line
ajax-cart-autoupdate-for-woocommerce.php:330 and change from
if (! is_cart() ) return; // Only if it's a cart page.
to

if ( ! is_cart() && ! is_checkout() ) {
			return;
		}

so the plugin will run as well on checkout.

My request is that you either make the function that runs this ajax_cart_autoupdate pluggable or add an option.

Making the cart and checkout stick together is not that hard if you use the shortcodes (and not code modification experiments as seen in other threads), my favourite is this for these types of implementations (leaving this here mostly in case someone bumps into it).

Thank you!