:+1: version and update docs

CHANGES.md

@@ -3,7 +3,8 @@ CHANGES
 
 ## 3.4.2-RC
 
-* 
+* Fix: Nofitication to Slack doesn't work
+    * Introduced by 3.4.0
 
 ## 3.4.1
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "growi",
-  "version": "3.4.2-RC",
+  "version": "3.4.3-RC",
   "description": "Team collaboration software using markdown",
   "tags": [
     "wiki",