Update readme

Author: tomasnk

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/airbus-cyber/graylog-plugin-aggregation-count.svg?branch=master)](https://travis-ci.org/airbus-cyber/graylog-plugin-aggregation-count)
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+[![GitHub Release](https://img.shields.io/badge/release-v2.0.0-blue.svg)](https://github.com/airbus-cyber/graylog-plugin-aggregation-count/releases)
 
 #### Alert condition plugin for Graylog to perform aggregation
 
@@ -14,8 +14,6 @@ Also perfect for example to be alerted when there are network port scans on your
 
 Please also take note that only a single alert is raised for this condition during the alerting interval, although multiple messages containing different values for the message fields may have been received since the last alert.
 
-**Required Graylog version:** 3.0.0 and later
-
 Example of raised alert:
 
 ![](https://raw.githubusercontent.com/airbus-cyber/graylog-plugin-aggregation-count/master/images/alert.png)
@@ -42,8 +40,6 @@ Restart `graylog-server` and you are done.
 
 First you have to select the alert type **Aggregation Count Alert Condition**
 
-![](https://raw.githubusercontent.com/airbus-cyber/graylog-plugin-aggregation-count/master/images/select_condition.png)
-
 Then, you can configure the **Grouping Fields**  and the **Distinction Fields** to count messages respectively with the same values and with distinct values.
 
 Optionally you can add a **Comment** about the configuration of the condition.