update README.md

Author: shi-yuan

README.md

@@ -65,7 +65,18 @@
 | 6.2.2         |     6.2.2     |
 | 6.2.3         |     6.2.3     |
 | 6.2.4         |     6.2.4     |
-| master        |     6.3.0     |
+| 6.3.0         |     6.3.0     |
+| master        |     6.3.1     |
+
+## 6.3.1 插件安装
+
+进入Elasticsearch目录运行如下命令
+
+````
+进入es目录执行如下命令
+
+./bin/elasticsearch-plugin install https://github.com/NLPchina/elasticsearch-analysis-ansj/releases/download/v6.3.1/elasticsearch-analysis-ansj-6.3.1.0-release.zip
+````
 
 ## 6.3.0 插件安装