Set core version

core.go

@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	version  = "4.20.0"
+	version  = "4.20.5"
 	build    = "Custom"
 	codename = "V2Fly, a community-driven edition of V2Ray."
 	intro    = "A unified platform for anti-censorship."