Make table config optional

[MangelMaxime]

Looking both at the code

jsPDF/src/modules/cell.js

Lines 378 to 384 in 2d9a919

	jsPDFAPI.table = function(x, y, data, headers, config) {
	_initialize.call(this);
	if (!data) {
	throw new Error("No data for PDF table.");
	}
	config = config || {};

and the tests

jsPDF/test/specs/cell.spec.js

Lines 85 to 93 in 2d9a919

	it("table with CellConfig[]", () => {
	var doc = new jsPDF({
	putOnlyUsedFonts: true,
	orientation: "landscape",
	floatPrecision: 2
	});
	doc.table(1, 1, generateData(100), header);
	comparePdf(doc.output(), "table.pdf");
	});

It seems like config is an optional argument.