v0.6.0

Enhancements

• New ArgumentGroup UDA for argument grouping in help message:

    @(ArgumentGroup("group1").Description("group1 description"))
    {
        @NamedArgument
        {
            string a;
            string b;
        }
        @PositionalArgument(0) string p;
    }

• New RequiredTogether UDA for arguments that must be specified together:

    @RequiredTogether()
    {
        string a;
        string b;
    }

• New MutuallyExclusive UDA for arguments that can't be specified together:

    @MutuallyExclusive()
    {
        string a;
        string b;
    }