double quotes for attribs

Author: jontsai

_includes/themes/htk/fragments/meta.html

@@ -13,5 +13,5 @@
 <meta name="google-site-verification" content="{{ site.verifications.google }}" />
 {% endif %}
 {% if site.verifications.yandex %}
-<meta name='yandex-verification' content="{{ site.verifications.yandex }}" />
+<meta name="yandex-verification" content="{{ site.verifications.yandex }}" />
 {% endif %}