experiment with markdown for readme

README.md

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+[![Build Status](https://travis-ci.org/schweikert/fping.svg?branch=develop)](https://travis-ci.org/schweikert/fping)
+
+h1. fping 3
+
+fping is a program to send ICMP echo probes to network hosts, similar to ping,
+but much better performing when pinging multiple hosts. fping has a long long
+story: Roland Schemers did publish a first version of it in 1992 and it has
+established itself since then as a standard tool.