metrics: update beats URL and description

README.md

@@ -534,7 +534,6 @@ _See also: [awesome-selfhosted/Database Management](https://github.com/awesome-s
 
 _See also: [Databases](#databases)_
 
-
 * Collectors only
   - [Collectd](https://collectd.org/) - System statistic collection daemon.
   - [Diamond](https://github.com/python-diamond/Diamond) - Python based statistic collection daemon.
@@ -548,8 +547,8 @@ _See also: [Databases](#databases)_
   - [RRDtool](http://oss.oetiker.ch/rrdtool/) - Industry standard, high performance data logging and graphing system for time series data.
 
 * Packages
+  - [Beats](https://www.elastic.co/beats/) - Single-purpose data shippers that send data from hundreds or thousands of machines and systems to Logstash or Elasticsearch.
   - [Graphite](http://graphite.readthedocs.org/en/latest/) - Scalable graphing server.
-  - [Packetbeat](https://www.elastic.co/products/beats) - Captures network traffic and displays it in a custom Kibana dashboard for easy viewing.
   - [Prometheus](http://prometheus.io/) - Service monitoring system and time series database.
   - [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) - Service monitoring system and time series database.