Fix import in README.md (#38)

Author: DavideViolante

README.md

@@ -59,7 +59,7 @@ const client = new Client({
 ```javascript
 const { STSClient, AssumeRoleCommand } = require("@aws-sdk/client-sts");
 const { Client } = require("@elastic/elasticsearch");
-const createAwsElasticsearchConnector = require("./src/index.js");
+const createAwsElasticsearchConnector = require("aws-elasticsearch-connector");
 
 async function ping() {
   const creds = await assumeRole(