doc(readme&notice):update notice year and update readme document (#332)

Author: RongtongJin

NOTICE

@@ -1,5 +1,5 @@
 Apache RocketMQ
-Copyright 2016-2020 The Apache Software Foundation
+Copyright 2016-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

README.md

@@ -23,6 +23,7 @@ This project aims to help developers quickly integrate [RocketMQ](http://rocketm
 - [x] Support message tracing
 - [x] Support authentication and authorization
 - [x] Support request-reply message exchange pattern
+- [x] Consume messages with push/pull mode
 
 ## Prerequisites
 - JDK 1.8 and above