Updated screenshots

Author: anthonygauthier

README.md

@@ -9,7 +9,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
 * Bulk requests
   * 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``. *Leave it empty if you don't want any filter!
+  * 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
   * debug : Send request/response information of all requests (headers, body, etc.)
   * info : Only send the request/response information of failed requests (headers, body, etc.)
@@ -31,9 +31,9 @@ Feel free to contribute by branching and making pull requests, or simply by sugg
 
 ## Screenshots
 ### Configuration
-![screnshot1](https://image.ibb.co/kDH3YH/Screen_Shot_2018_02_23_at_2_18_03_PM.png "Screenshot of configuration")
-### Very simple example of Kibana dashboard
-![screnshot1](https://image.ibb.co/bA1oYH/Screen_Shot_2018_02_23_at_2_37_46_PM.png "Example Kibana dashboard")
+![screnshot1](https://image.ibb.co/kPMn2x/Screen_Shot_2018_03_21_at_9_58_25_AM.png "Screenshot of configuration")
+### Sample Grafana dashboard
+![screnshot1](https://image.ibb.co/jW6LNx/Screen_Shot_2018_03_21_at_10_21_18_AM.png "Sample Grafana Dashboard")
 
 ## Sample ElasticSearch Index