Add coverage badge

Author: Krusen

README.md

@@ -1,6 +1,7 @@
 BencodeNET 
 ==========
 [![AppVeyor](https://ci.appveyor.com/api/projects/status/pikvrmie3ibsk6pt/branch/master?svg=true)](https://ci.appveyor.com/project/Krusen/bencodenet)
+[![Coverage](https://coveralls.io/repos/github/Krusen/BencodeNET/badge.svg?branch=master)](https://coveralls.io/github/Krusen/BencodeNET?branch=master)
 [![NuGet](https://buildstats.info/nuget/bencodenet?includePreReleases=false)](https://www.nuget.org/packages/BencodeNET/)
 
 A .NET library for encoding and decoding bencode.
@@ -220,4 +221,4 @@ BDictionary bdictionary = parser.ParseString<BDictionary>("d3:fooi42e5:Hello6:Wo
 
 // If you don't know the type you are parsing, you can use the non-generic method
 IBObject bobject = parser.ParseString("12:Hellow World!");
-```
+```