add 2.3.1 install

ansjsun · ansjsun · commit f1e902d2cc34 · 2016-04-21T16:53:06.000+08:00
diff --git a/README.md b/README.md
@@ -38,6 +38,7 @@ Versions
 | 2.2.0                 | 2.2.0.1        | delete commands not supported  | elastic2.2.0 |
 | 2.2.1                 | 2.2.1.0        | delete commands not supported  | elastic2.2.1 |
 | 2.3.0                 | 2.3.0.0        | delete commands not supported  | elastic2.3.0 |
+| 2.3.1                 | 2.3.1.0        | delete commands not supported  | elastic2.3.1 |
 
 ### Elasticsearch 1.X
 ````
@@ -71,6 +72,10 @@ Versions
 ````
 ./bin/plugin install https://github.com/NLPchina/elasticsearch-sql/releases/download/2.3.0.0/elasticsearch-sql-2.3.0.0.zip 
 ````
+### Elasticsearch 2.3.1
+````
+./bin/plugin install https://github.com/NLPchina/elasticsearch-sql/releases/download/2.3.1.0/elasticsearch-sql-2.3.1.0.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}`.
 
