:+1: version and update docs

CHANGES.md

@@ -1,16 +1,18 @@
 # CHANGES
 
-## 3.5.15-RC
+## 3.5.16-RC
 
 * 
 
-## 3.5.14
+## 3.5.15
 
 * Feature: Import/Export Page data
 * Fix: The link to Sandbox on Markdown Help Modal doesn't work
 * Support: Upgrade libs
     * codemirror
 
+## 3.5.14 (Missing number)
+
 ## 3.5.13
 
 * Feature: Re-edit comments

package.json

@@ -1,6 +1,6 @@
 {
   "name": "growi",
-  "version": "3.5.15-RC",
+  "version": "3.5.16-RC",
   "description": "Team collaboration software using markdown",
   "tags": [
     "wiki",