Update README.md

README.md

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-PowerAPI
-========
+# PowerAPI
 PowerAPI is a middleware toolkit for buidling software-defined power meters. Software-defined power meters are software librairies that estimates the power consumption of software in real-time. PowerAPI supports the acquisition of raw metrics from a wide diversity of sensors (physical meters, processor interfaces, hardware counters, OS counters) and the delivery of power consumptions via different interfaces (filesystem, network, web, graphical).
 
-About
-=====
+# About
 PowerAPI is an open-source project developed by the [Spirals research group](https://team.inria.fr/spirals) (University of Lille 1 and Inria).
 
-## Acknowledgments
+# Acknowledgments
 We all stand on the shoulders of giants and get by with a little help from our friends. PowerAPI is written in [Scala](http://www.scala-lang.org) and built on top of:
 * [Akka](http://akka.io), for async processing
 
-Licence
-=======
+# Licence
 This software is licensed under the GNU Affero General Public License, quoted below.
 
 Copyright (C) 2011-2014 Inria, University Lille 1.