Bump version (#698)

CHANGELOG.md

+# v0.2.3 - 2020-08-11
+* Fixes synchronization issue where missing messages were not requested more than once
+* Fixes node's dashboard explorer crashing or not properly visualizing the payload of a given message
+* Improves Grafana local dashboard:
+    * Adds support for the sync-beacon payload type
+    * Displaying uptime and nodeID
+* Fixed all linter issues to improve code quality
+
 # v0.2.2 - 2020-07-27
 * Improves message and transaction validation: 
     * Adjust max transaction inputs count;

plugins/banner/plugin.go

@@ -18,7 +18,7 @@ var (
 
 const (
 	// AppVersion version number
-	AppVersion = "v0.2.2"
+	AppVersion = "v0.2.3"
 
 	// AppName app code name
 	AppName = "GoShimmer"