Update README.md

Author: NikolayPianikov

CSharpInteractive.HostApi/DotNetCommands.cs

@@ -295,7 +295,7 @@ public IStartInfo GetStartInfo(IHost host)
 /// 
 /// var lines = new List<string>();
 /// new DotNetListPackage()
-///     .WithWorkingDirectory("MyLib")
+///     .WithProject(Path.Combine("MyLib", "MyLib.csproj"))
 ///     .WithVerbosity(DotNetVerbosity.Minimal)
 ///     .Run(output => lines.Add(output.Line));
 ///