remove unused method

Author: Bertk

src/coverlet.console/Program.cs

@@ -338,8 +338,6 @@ private static Command WithHandler(this Command command, string methodName)
             return command;
         }
 
-static string GetAssemblyVersion() => typeof(Program).Assembly.GetName().Version.ToString();
-
         static string InvariantFormat(double value) => value.ToString(CultureInfo.InvariantCulture);
     }
 }