Update README.md

Author: Matthiee

README.md

@@ -18,7 +18,7 @@ A simple, light-weight and strongly typed commandline parser made in .Net standa
 
 ## Installation
 ```powershell
-PM> Install-Package MatthiWare.CommandLineParser
+PM> Install-Package MatthiWare.CommandLineParser -Version 0.2.0-alpha
 ```
 
 # Quick Start
@@ -64,4 +64,4 @@ Run command line
 dotnet myapp --port 2551
 ```
 
-### For more advanced configuration options see [the wiki](https://github.com/MatthiWare/CommandLineParser.Core/wiki). 
+### For more advanced configuration options see [the wiki](https://github.com/MatthiWare/CommandLineParser.Core/wiki).