Request: Do no discover abstract CommandHandler classes

[MarkusBernhardt]

Could you please add the condition !x.IsAbstract() in CommandRegistry:

    public ICommandRegistry Discover(params Assembly[] assemblies)
        {
            Type commandHandlerBase = typeof(ICommandHandlerBase);
            foreach (Assembly assembly in assemblies)
            {
                Type[] handlers = assembly.GetTypes().Where(x => !x.IsAbstract() && commandHandlerBase.IsAssignableFrom(x)).ToArray();
                foreach (Type handler in handlers)
                {
                    Register(handler);
                }
            }
            return this;
        }

I'm using some abstract CommandHandler base classes with unspecified generic parameters that will crash FunctionMonkey when registered to the CommandRegistry.