Change the Add to cart button on shop pages into a Read More link

functions.php

add_action('init','remove_loop_button');

function remove_loop_button(){
remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10 );
}

add_action('woocommerce_after_shop_loop_item','replace_add_to_cart');

function replace_add_to_cart() {
global $product;
$link = $product->get_permalink();
    echo do_shortcode('<a href="'.$link.'" class="button addtocartbutton">Read More</a>');
}