Update README.md

Author: anthonygauthier

README.md

@@ -10,7 +10,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
   * By making bulk requests, there are practically no impacts on the performance of the tests themselves. 
 * Filters
   * Only send the samples you want by using Filters! Simply type them as follows in the appropriate field : ``filter1;filter2;filter3`` or ``sampleLabel_must_contain_this``.
-* Verbose, semi-verbose, and quiet mode
+* Verbose, semi-verbose, error only, and quiet mode
   * __debug__ : Send request/response information of all samplers (headers, body, etc.)
   * __info__ : Sends all samplers to the ElasticSearch engine, but only sends the headers, body info for the failed samplers.
   * __quiet__ : Only sends the response time, bytes, and other metrics