:+1: version and update docs

CHANGES.md

@@ -1,14 +1,15 @@
 # CHANGES
 
-## v4.2.18
+## v4.2.18-RC
 * Feature: Cobvertible page contents width.
-## v4.2.17-RC
+
+## v4.2.17
 
 * Improvement: Invoke garbage collection when reindex all pages by elasticsearch
 * Improvement: Hide Sidebar at shared pages
 * Fix: No unsaved alert is displayed without difference the latest markdown and editor value
 
-## v4.2.16-RC
+## v4.2.16
 
 * Fix: "Only inside the group" causes an error
     * Introduced by v4.2.15

package.json

@@ -1,6 +1,6 @@
 {
   "name": "growi",
-  "version": "4.2.17-RC",
+  "version": "4.2.18-RC",
   "description": "Team collaboration software using markdown",
   "tags": [
     "wiki",