Update index.html

Author: MichaelCurrin

docs/index.html

@@ -26,7 +26,7 @@
     <script src="//unpkg.com/docsify-edit-on-github@1/index.js"></script>
 
     <script defer src="//unpkg.com/docsify@4/lib/docsify.min.js"></script>
-    <script defer src="//unpkg.com/prismjs@1.28.0/components/prism-markdown.min.js"></script>
+    <script defer src="//unpkg.com/prismjs@1/components/prism-markdown.min.js"></script>
 
 </head>