Update README.md

Author: mindkinbuild

README.md

@@ -1,4 +1,4 @@
-# Serilog.Sinks.Async
+# Serilog.Sinks.Async [![Build status](https://ci.appveyor.com/api/projects/status/rostpmo2gq08ecag?svg=true)](https://ci.appveyor.com/project/mindkin/serilog-sinks-async)
 An Async Serilog sink
 
 Use this buffered async delegating sink to reduce the time it takes for your logging thread to write to your sink.
@@ -30,4 +30,4 @@ Log.Logger = new LoggerConfiguration()
     .WriteTo.Async(x => x.Sink(new YourSink), 500) //Max number of logevents to buffer in memory
     // Other logger configurationg
     .CreateLogger()
-```
+```