Update layout.pug

Quick Typo fix

Author: nloadholtes

views/website/layout.pug

@@ -63,7 +63,7 @@ html(lang='en')
             span Missing something?
             a(href='https://github.com/jsonwebtoken/jsonwebtoken.github.io/tree/master/views', target="_blank") Send a Pull Request
             a(style='text-decoration: none') -
-            a(href='https://github.com/jsonwebtoken/jsonwebtoken.github.io/blob/master/LICENSE.txt', target="_blank") Licence
+            a(href='https://github.com/jsonwebtoken/jsonwebtoken.github.io/blob/master/LICENSE.txt', target="_blank") License
           .column.social-counter
             a.twitter-follow-button(href='https://twitter.com/auth0', data-show-count='true') Follow @auth0