Update _config.yml

Switch to https

Author: vraychev

_config.yml

@@ -30,7 +30,7 @@ menu:
 # Owner/author information
 owner:
   name:           Multiple authors
-  site:           http://learnbigcode.github.com
+  site:           https://learnbigcode.github.com
   avatar:         images/avatar.jpg
   bio:            "Your bio goes here. It shouldn't be super long but a good two sentences or two should suffice."
   email:          [email protected]