Merge pull request #40 from KeithZhang/bugfix-create-consumer

issue about:
diff --git a/packages/dubbo/src/zookeeper.ts b/packages/dubbo/src/zookeeper.ts
index 5d6811b..a788494 100644
--- a/packages/dubbo/src/zookeeper.ts
+++ b/packages/dubbo/src/zookeeper.ts
@@ -361,8 +361,7 @@
       revision: '',
       version: version,
       side: 'consumer',
-      check: 'false',
-      timestamp: Date.now(),
+      check: 'false'
     };
 
     const consumerRoot = `/dubbo/${dubboInterface}/consumers`;