Properly escaping

Dear Sirs,
I’m looking into your theme as a starting point for a theme of mine.

I noticed a couple of issues I found when I was inspecting your code:

– header.php
.line 33: esc_attr instead of esc_url
.line 19: do we really need it? There’s already wp_bootstrap_starter_pingback_header() in extras.php (that you took from underscore) (btw, line 19 bloginfo should be escaped as in wp_bootstrap_starter_pingback_header)

Cheers