fix subscriptionFromGrpc (#164)

Author: daleiz

client/src/main/java/io/hstream/util/GrpcUtils.java

@@ -67,6 +67,7 @@ public static Subscription subscriptionFromGrpc(io.hstream.internal.Subscription
     return Subscription.newBuilder().subscription(subscription.getSubscriptionId()).stream(
             subscription.getStreamName())
         .ackTimeoutSeconds(subscription.getAckTimeoutSeconds())
+        .maxUnackedRecords(subscription.getMaxUnackedRecords())
         .offset(subscriptionOffsetFromGrpc(subscription.getOffset()))
         .createdTime(Instant.ofEpochSecond(createdTime.getSeconds(), createdTime.getNanos()))
         .build();