bump 1.5.2

docs/_coverpage.md

@@ -1,6 +1,6 @@
 ![logo](_media/icon.svg)
 
-# docsify <small>1.5.1</small>
+# docsify <small>1.5.2</small>
 
 > A magical documentation site generator.
 

lib/docsify.js

@@ -127,7 +127,9 @@ function slugify (string) {
   var slug = string.trim()
     .replace(/<[^>\d]+>/g, '')
     .replace(re, '')
-    .replace(/\s/g, replacement);
+    .replace(/\s/g, replacement)
+    .replace(/-+/g, replacement)
+    .replace(/^(\d)/, '_$1');
   var occurrences = slugify.occurrences[slug];
 
   if (slugify.occurrences.hasOwnProperty(slug)) {