Update runtime files
diff --git a/runtime/tutor/tutor.utf-8 b/runtime/tutor/tutor.utf-8
index a78e6a4..98c4177 100644
--- a/runtime/tutor/tutor.utf-8
+++ b/runtime/tutor/tutor.utf-8
@@ -955,7 +955,7 @@
 	Publisher: New Riders
   The first book completely dedicated to Vim.  Especially useful for beginners.
   There are many examples and pictures.
-  See http://iccf-holland.org/click5.html
+  See https://iccf-holland.org/click5.html
 
   This book is older and more about Vi than Vim, but also recommended:
 	Learning the Vi Editor - by Linda Lamb