upgrade docsify version to fix potential xss vulnerability

docs/index.html

@@ -154,19 +154,19 @@
   </script>
 
   <!-- docsify -->
-  <script src="//unpkg.com/docsify@4.12.2/lib/docsify.min.js"></script>
+  <script src="//unpkg.com/docsify@4.13.1/lib/docsify.min.js"></script>
 
   <!-- docsify plugins -->
   <!-- support search -->
-  <script src="//unpkg.com/docsify@4.12.2/lib/plugins/search.min.js"></script>
+  <script src="//unpkg.com/docsify@4.13.1/lib/plugins/search.min.js"></script>
   <!-- Support docsify sidebar catalog expand and collapse -->
   <script src="//unpkg.com/docsify-sidebar-collapse@1.3.5/dist/docsify-sidebar-collapse.min.js"></script>
   <!-- Medium's image zoom -->
-  <script src="//unpkg.com/docsify@4.12.2/lib/plugins/zoom-image.min.js"></script>
+  <script src="//unpkg.com/docsify@4.13.1/lib/plugins/zoom-image.min.js"></script>
   <!-- Add a simple Click to copy button to all preformatted code blocks to effortlessly allow users to copy example code from your docs -->
   <script src="//unpkg.com/docsify-copy-code@2.1.1/dist/docsify-copy-code.min.js"></script>
   <!-- docsify-pagination -->
-  <script src="//unpkg.com/docsify-pagination@2.6.2/dist/docsify-pagination.min.js"></script>
+  <script src="//unpkg.com/docsify-pagination@2.10.1/dist/docsify-pagination.min.js"></script>
 
   <!-- code highlight -->
   <script src="//unpkg.com/prismjs@1.27.0/components/prism-bash.min.js"></script>