Open "Continue Reading" in New Tab with Twenty Sixteen Child Theme

I have created a child theme of the Twenty Sixteen theme, and I want to make the “Continue Reading” button open in a new tab. It seems like it should be straightforward, but I can’t seem to find any place to put the appropriate code that actually works. I edited “template-tags.php” and added the target code, but it didn’t do anything.

Here’s the chunk of modified code:

if ( ! function_exists( 'twentysixteen_excerpt_more' ) && ! is_admin() ) :
/**
 * Replaces "[...]" (appended to automatically generated excerpts) with ... and
 * a 'Continue reading' link.
 *
 * Create your own twentysixteen_excerpt_more() function to override in a child theme.
 *
 * @since Twenty Sixteen 1.0
 *
 * @return string 'Read More' link prepended with an ellipsis.
 */
function twentysixteen_excerpt_more() {
	$link = sprintf( '<a target="_blank" href="%1$s" class="more-link">%2$s</a>',
		esc_url( get_permalink( get_the_ID() ) ),
		/* translators: %s: Name of current post */
		sprintf( __( 'Read More', 'twentysixteen' ), get_the_title( get_the_ID() ) )
	);
	return ' &hellip; ' . $link;
}
add_filter( 'excerpt_more', 'twentysixteen_excerpt_more' );
endif;

And, here’s a link to the site: https://thelittlethingsdiy.com