update README.md

Author: shi-yuan

README.md

@@ -45,7 +45,18 @@
 | 5.6.0         |     5.6.0     |
 | 5.6.1         |     5.6.1     |
 | 5.6.2         |     5.6.2     |
-| master        |     5.6.3     |
+| 5.6.3         |     5.6.3     |
+| master        |     5.6.4     |
+
+## 5.6.4 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/v5.6.4/elasticsearch-analysis-ansj-5.6.4.0-release.zip
+````
 
 ## 5.6.3 插件安装