Switch external links to HTTPS

Author: manandbytes

_includes/footer.md

@@ -1,5 +1,5 @@
-* Edited -- with [Org mode](http://orgmode.org/) in [Emacs](https://www.gnu.org/software/emacs/)
-* Published -- [Jekyll](http://jekyllrb.com/)
+* Edited -- with [Org mode](https://orgmode.org/) in [Emacs](https://www.gnu.org/software/emacs/)
+* Published -- [Jekyll](https://jekyllrb.com/)
 * Hosted -- [Github Pages](https://pages.github.com/)
 
 © 2011-2018 {{ site.author.name }}