update README.md

Author: shi-yuan

README.md

@@ -17,7 +17,7 @@ Elasticsearch-SQL
 
 **6.8.23** [![6.8.23 Build Status](https://travis-ci.com/NLPchina/elasticsearch-sql.svg?branch=elastic6.8.23)](https://travis-ci.com/github/NLPchina/elasticsearch-sql)
 **7.17.23** [![7.17.23 Build Status](https://travis-ci.com/NLPchina/elasticsearch-sql.svg?branch=elastic7.17.23)](https://travis-ci.com/github/NLPchina/elasticsearch-sql)
-**8.14.3** [![8.14.3 Build Status](https://travis-ci.com/NLPchina/elasticsearch-sql.svg?branch=elastic8.14.3)](https://travis-ci.com/github/NLPchina/elasticsearch-sql)
+**8.15.0** [![8.15.0 Build Status](https://travis-ci.com/NLPchina/elasticsearch-sql.svg?branch=elastic8.15.0)](https://travis-ci.com/github/NLPchina/elasticsearch-sql)
 **master** [![master Build Status](https://travis-ci.com/NLPchina/elasticsearch-sql.svg?branch=master)](https://travis-ci.com/github/NLPchina/elasticsearch-sql)
 
 Query elasticsearch using familiar SQL syntax.
@@ -258,6 +258,7 @@ Versions
 | 8.14.1                | 8.14.1.0       |                                | elastic8.14.1|
 | 8.14.2                | 8.14.2.0       |                                | elastic8.14.2|
 | 8.14.3                | 8.14.3.0       |                                | elastic8.14.3|
+| 8.15.0                | 8.15.0.0       |                                | elastic8.15.0|
 
 ### Elasticsearch 1.x
 ````
@@ -1322,6 +1323,11 @@ Versions
 ./bin/elasticsearch-plugin install https://github.com/NLPchina/elasticsearch-sql/releases/download/v8.14.3/elasticsearch-sql-8.14.3.0.zip
 ````
 
+### Elasticsearch 8.15.0
+````
+./bin/elasticsearch-plugin install https://github.com/NLPchina/elasticsearch-sql/releases/download/v8.15.0/elasticsearch-sql-8.15.0.0.zip
+````
+
 After doing this, you need to restart the Elasticsearch server. Otherwise you may get errors like `Invalid index name [sql], must not start with '']; ","status":400}`.
 
 ## Basic Usage