adds reference to the original GH issue

Signed-off-by: Oleh Dokuka <oleh.dokuka@icloud.com>

Author: OlegDokuka

rsocket-transport-netty/src/test/java/io/rsocket/integration/KeepaliveTest.java

@@ -26,6 +26,10 @@
 import reactor.util.retry.Retry;
 import reactor.util.retry.RetryBackoffSpec;
 
+/**
+ * Test case that reproduces the following
+ * <a href="https://github.com/rsocket/rsocket-java/issues/1099">GitHub Issue</a>
+ */
 public class KeepaliveTest {
 
   private static final Logger LOG = LoggerFactory.getLogger(KeepaliveTest.class);