Removed unused imports

Author: rampatra

src/main/java/com/rampatra/blockchain/MessageHandler.java

@@ -1,7 +1,5 @@
 package com.rampatra.blockchain;
 
-import sun.net.ConnectionResetException;
-
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;