manishsuwal on "How to esc_url()"

I'm developing a theme.

When I did Theme Check before giving my theme to the review team it said:

INFO: Possible hard-coded links were found in the file footer.php.
Line 53:

[ Moderator note: please wrap code in backticks or use the code button. ]

<?php printf( __( 'Theme: %1$s by %2$s.', 'willingness' ), 'willingness', '<a href='http://enwil.com/' rel='designer'>Manish Suwal</a>' ); ?>

It's this code that's hard-coded:

<a href='http://enwil.com/' rel='designer'>

How do you escape that URL?