change version to 4.0.0

Author: Matt

chainbase/src/main/java/org/tron/core/db2/core/Chainbase.java

@@ -19,6 +19,8 @@
 
 public class Chainbase implements IRevokingDB {
 
+  public static Map<String, byte[]> assertsAddress = new HashMap<>(); // key = name , value = address
+  //true:fullnode, false:soliditynode
   private ThreadLocal<Boolean> mode = new ThreadLocal<>();
   private Snapshot head;