problem: WS proxy uses binary frames (#182)

fix: #180
(cherry picked from commit 2dcb56e8c4467cfdc549fe918427fce593703ca3)
(cherry picked from commit 5df10706dd)

src/main/kotlin/io/emeraldpay/dshackle/proxy/WebsocketHandler.kt

@@ -27,7 +27,6 @@ import io.emeraldpay.dshackle.rpc.NativeSubscribe
 import io.emeraldpay.etherjar.rpc.json.RequestJson
 import io.emeraldpay.etherjar.rpc.json.ResponseJson
 import io.netty.buffer.ByteBufInputStream
-import io.netty.buffer.Unpooled
 import org.reactivestreams.Publisher
 import org.slf4j.LoggerFactory
 import reactor.core.publisher.Flux
@@ -74,9 +73,8 @@ class WebsocketHandler(
             val eventHandler = accessHandler.start(req, routeConfig.blockchain)
 
             val responses = respond(routeConfig.blockchain, control, requests, eventHandler)
-                .map { Unpooled.wrappedBuffer(it.toByteArray()) }
 
-            resp.send(responses)
+            resp.sendString(responses, Charsets.UTF_8)
                 .then()
         }
     }