Merge pull request #664 from dbryan0516/websocket-headers

Added WebSocketClient constructor to allow access to headers

Author: conor10

core/src/main/java/org/web3j/protocol/websocket/WebSocketClient.java

@@ -1,6 +1,7 @@
 package org.web3j.protocol.websocket;
 
 import java.net.URI;
+import java.util.Map;
 
 import org.java_websocket.handshake.ServerHandshake;
 import org.slf4j.Logger;
@@ -20,6 +21,10 @@ public WebSocketClient(URI serverUri) {
         super(serverUri);
     }
 
+    public WebSocketClient(URI serverUri, Map<String,String> httpHeaders) {
+        super(serverUri, httpHeaders);
+    }
+
     @Override
     public void onOpen(ServerHandshake serverHandshake) {
         log.info("Opened WebSocket connection to {}", uri);