modify client name (#177)

change client name to @opensearch-project/opensearch

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

README.md

@@ -42,7 +42,7 @@ If you prefer to add the client manually or just want to examine the source code
 Then require the client:
 
 ```javascript
-const { Client } = require('@opensearch/opensearch')
+const { Client } = require('@opensearch-project/opensearch')
 ```
 
 
@@ -62,7 +62,7 @@ var ca_certs_path = '/full/path/to/root-ca.pem';
 // var client_key_path = '/full/path/to/client-key.pem'
 
 // Create a client with SSL/TLS enabled.
-var { Client } = require('@opensearch/opensearch');
+var { Client } = require('@opensearch-project/opensearch');
 var fs = require('fs');
 var client = new Client({
     node: protocol + '://' + auth + '@' + host + ':' + port,