update docs

CHANGES.md

@@ -2,7 +2,8 @@
 
 ## v4.2.5-RC
 
-* 
+* Improvement: Invoke garbage collection when reindex all pages by elasticsearch
+* Fix: MathJax rendering does not work
 
 ## v4.2.4
 
@@ -52,6 +53,10 @@
     * migrate-mongo
     * mongoose
 
+## v4.1.13
+
+* Fix: MathJax rendering does not work
+
 ## v4.1.12
 
 * Fix: Adjust line-height for pre under li