Removed -Pre flags from package installation instructions [Skip CI]

Author: nblumhardt

README.md

@@ -11,8 +11,8 @@ This package routes ASP.NET log messages through Serilog, so you can get informa
 **First**, install the _Serilog.Extensions.Logging_ [NuGet package](https://www.nuget.org/packages/Serilog.Extensions.Logging) into your web or console app. You will need a way to view the log messages - _Serilog.Sinks.Literate_ writes these to the console.
 
 ```powershell
-Install-Package Serilog.Extensions.Logging -Pre -DependencyVersion Highest
-Install-Package Serilog.Sinks.Literate -Pre
+Install-Package Serilog.Extensions.Logging -DependencyVersion Highest
+Install-Package Serilog.Sinks.Literate
 ```
 
 **Next**, in your application's `Startup` method, configure Serilog first: