Remove a stray letter 'u'

Author: nblumhardt

README.md

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 # Serilog.Sinks.Async [![Build status](https://ci.appveyor.com/api/projects/status/gvk0wl7aows14spn?svg=true)](https://ci.appveyor.com/project/serilog/serilog-sinks-async) [![NuGet](https://img.shields.io/nuget/v/Serilog.Sinks.Async.svg)](https://www.nuget.org/packages/Serilog.Sinks.Async) [![Join the chat at https://gitter.im/serilog/serilog](https://img.shields.io/gitter/room/serilog/serilog.svg)](https://gitter.im/serilog/serilog)
 
 An asynchronous wrapper for other [Serilog](https://serilog.net) sinks. Use this sink to reduce the overhead of logging calls by delegating work to a background thread. This is especially suited to non-batching sinks like the [File](https://github.com/serilog/serilog-sinks-file) and [RollingFile](https://github.com/serilog/serilog-sinks-rollingfile) sinks that may be affected by I/O bottlenecks.
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 **Note:** many of the network-based sinks (_CouchDB_, _Elasticsearch_, _MongoDB_, _Seq_, _Splunk_...) already perform asychronous batching natively and do not benefit from this wrapper.
 
 ### Getting started