Use is to compare types

[DimitriPapadopoulos]

This is consistent with other similar checks in the code base:

python-tabulate/tabulate/__init__.py

Lines 123 to 124 in 71282a6

	def _is_separating_line_value(value):
	return type(value) is str and value.strip() == SEPARATING_LINE

I wonder whether isinstance() would be more appropriate. I mean, subclasses of list and str would also fit here.

[codecov-commenter]

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[astanin]

Good point about subclasses, but this is used with built-in TableFormats, so using is is fine for now.

It may break some custom user's formats, but it's unlikely.