:+1: version and update docs

CHANGES.md

@@ -12,9 +12,6 @@
 * Improvement: Basic layout of page
 * Support: Support MongoDB 4.0, 4.2 and 4.4
 
-## v4.1.7
-
-* 
 
 ## v4.1.6
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "growi",
-  "version": "4.1.7-RC",
+  "version": "4.2.0-RC",
   "description": "Team collaboration software using markdown",
   "tags": [
     "wiki",