Add missing new line

Author: JonRowe

source/layouts/layout.slim

@@ -67,4 +67,4 @@ html.no-js lang="en"
         = image_tag "https://cdn.dnsimple.com/assets/resolving-with-us/logo-dark.png", alt: "DNSimple", style: "width:100px;"
     = partial 'google_analytics'
     = partial 'seed_and_dew'
-  script src="/javascripts/asciinema-player.js"
+  script src="/javascripts/asciinema-player.js"