Narrow type on assertCount to non-empty-*

[michalbundyra]

As noted here #54 (comment)

Assert::assertCount(1, $array);

Not sure if it is possible to implement narrowing type to non-empty-* here.
This would be very helpful, so we do not need to add assertNotEmpty assertion.

Thanks

[ondrejmirtes]

Yeah, we can rewrite that to count($array) === 1.

[michalbundyra]

Done via d5242a5

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