Update version

Author: swallez

README.md

@@ -66,7 +66,7 @@ that is compatible with the version of Elasticsearch you're using
 
 ```toml
 [dependencies]
-elasticsearch = "7.13.0-alpha.1"
+elasticsearch = "7.14.0-alpha.1"
 ```
 
 The following _optional_ dependencies may also be useful to create requests and read responses