How to change thumbnail image size of WooCommerce cart page

To change thumbnail image size of WooCommerce cart page you need next steps:
1. in function.php create the size you need.

if ( function_exists( 'add_image_size' ) ) {
	add_image_size( 'custom-thumb', 100, 100 ); // 100 wide and 100 high
}

2. in cart.php which should be located in your_tneme\woocommerce\cart find

$thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );

and in get_image() write the name of your size. In our case it will be like this: get_image(‘custom-thumb’)

Checked work on WooCommerce 3.5.2