use nested list instead of h3 heading to make it easier to read

README.md

@@ -409,14 +409,14 @@
 ## Metric & Metric Collection
 *Metric gathering and display software.*
 
-### Collectors only
+* Collectors only
   * [Diamond](https://github.com/BrightcoveOS/Diamond) - Python based statistic collection daemon.
   * [Collectd](http://collectd.org/) - System statistic collection daemon.
   * [Collectl](http://collectl.sourceforge.net/) - High precision system performance metrics collecting tool.
   * [Statsd](https://github.com/etsy/statsd/) - Application statistic listener.
   * [tcollector](http://opentsdb.net/docs/build/html/user_guide/utilities/tcollector.html) - System statistic collection daemon written in Python for OpenTSDB
 
-### Dashboards
+* Dashboards
   * [Grafana](http://grafana.org/) - A Graphite & InfluxDB Dashboard and Graph Editor.
   * [Ganglia](http://ganglia.sourceforge.net/) - High performance, scalable RRD based monitoring for grids and/or clusters of servers. Compatible with Graphite using a single collection process.
   * [RRDtool](http://oss.oetiker.ch/rrdtool/) - Industry standard, high performance data logging and graphing system for time series data.
@@ -424,17 +424,16 @@
   * [Facette](http://facette.io) - Time series data visualization and graphing software written in Go.
   * [Freeboard](https://github.com/Freeboard/freeboard) - A damn-sexy front-end real-time dashboard for the internet of things. Transforms raw JSON into delicious UI.
 
-### Storage
+* Storage
   * [OpenTSDB](http://opentsdb.net/) - Store and server massive amounts of time series data without losing granularity.
   * [KairosDB](https://code.google.com/p/kairosdb/) - Fast distributed scalable time series database, fork of OpenTSDB 1.x.
   * [InfluxDB](http://influxdb.com/) - Distributed time series database with no external dependencies.
 
-### Packages
+* Packages
   * [Prometheus](http://prometheus.io/) - Service monitoring system and time series database.
   * [Packetbeat](http://packetbeat.com/) - Captures network traffic and displays it in a custom Kibana dashboard for easy viewing.
   * [Graphite](http://graphite.readthedocs.org/en/latest/) - Scalable graphing server.
 
-
 ## Network Configuration Management
 *Network configuration management tools.*