fix: use https for ajax.googleapis.com to get jQuery (#41)

Author: crccheck

_layouts/docs.html

@@ -8,7 +8,7 @@
     <title>yargs</title>
 
     <!-- Flatdoc -->
-    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
     <script src='https://cdn.rawgit.com/rstacruz/flatdoc/v0.9.0/legacy.js'></script>
     <script src='https://cdn.rawgit.com/rstacruz/flatdoc/v0.9.0/flatdoc.js'></script>