:+1: version and update docs

CHANGES.md

@@ -1,9 +1,13 @@
 CHANGES
 ========
 
-## 3.1.1-RC
+## 3.1.2-RC
 
 * Improvement: Add 'future' theme
+
+## 3.1.1-RC
+
+* Improvement: Add 'blue-night' theme
 * Improvement: List up pages which restricted for Group ACL
 * Fix: PageGroupRelation didn't remove when page is removed completely
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "growi",
-  "version": "3.1.1-RC",
+  "version": "3.1.2-RC",
   "description": "Team collaboration software using markdown",
   "tags": [
     "wiki",