Cannot use `\n` as delimiter

[Chewy5639]

Describe the bug Attempting to set CsvConfiguration.Delimiter to \n results in validation error:

The delimiter ' ' cannot be a line ending. ('\r', '\n', '\r\n')

To Reproduce

var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
    Delimiter = "\n",
    NewLine = "~" //Some non line ending character
};

_csvReader = new CsvReader(reader, config);

Expected behavior It appears that the CsvConfiguration.Validate method is checking against a hard coded array of line ending characters. The expected behaviour is to allow Delimiter to be \r, \n, or \r\n as long as NewLine is something different.