fix(doc): update notice and open statistic label (#375)

diff --git a/NOTICE b/NOTICE
index 85e2dc3..65ebdd0 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache RocketMQ
-Copyright 2016-2019 The Apache Software Foundation
+Copyright 2016-2020 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
diff --git a/README.md b/README.md
index f4233a9..93f0201 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/apache/rocketmq-client-go)](https://goreportcard.com/report/github.com/apache/rocketmq-client-go)
 [![GoDoc](https://img.shields.io/badge/Godoc-reference-blue.svg)](https://godoc.org/github.com/apache/rocketmq-client-go)
 [![CodeCov](https://codecov.io/gh/apache/rocketmq-client-go/branch/master/graph/badge.svg)](https://codecov.io/gh/apache/rocketmq-client-go)
+[![GitHub release](https://img.shields.io/badge/release-download-default.svg)](https://github.com/apache/rocketmq-client-go/releases)
+[![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/apache/rocketmq-client-go.svg)](http://isitmaintained.com/project/apache/rocketmq-client-go "Average time to resolve an issue")
+[![Percentage of issues still open](http://isitmaintained.com/badge/open/apache/rocketmq-client-go.svg)](http://isitmaintained.com/project/apache/rocketmq-client-go "Percentage of issues still open")
+![Twitter Follow](https://img.shields.io/twitter/follow/ApacheRocketMQ?style=social)
 
 ( The alpha version of Apache RocketMQ Go in Pure Go has been released, Welcome have a try! [native version](https://github.com/apache/rocketmq-client-go/tree/native) )