For `many` and `fold`, consider `..0` an invalid range, just as `0..0` is

[cky]

nom::multi::many and nom::many::fold consider empty ranges, as checked by NomRange::is_inverted, to be invalid. Unfortunately, that method is incorrectly implemented for RangeTo, meaning that ..0 is not considered invalid when it should be.

While I'm here, I also fixed up off-by-one errors in RangeFrom::bounded_iter and RangeFull::bounded_iter.

[coveralls]

Pull Request Test Coverage Report for Build 4050233552

• 6 of 9 (66.67%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 62.55%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/traits.rs	6	9	66.67%
<!--	Total:	6	9	66.67%	-->

Files with Coverage Reduction	New Missed Lines	%
src/character/streaming.rs	1	78.38%
<!--	Total:	1		-->

Totals
Change from base Build 3981619336:	0.3%
Covered Lines:	1560
Relevant Lines:	2494

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💛 - Coveralls