Take slice as input for parse_keywords

[Dandandan]

Just a purely mechanical change to change parse_keywords take a slice instead of a Vec.

[coveralls]

Pull Request Test Coverage Report for Build 132630018

• 21 of 21 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.708%

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Totals
Change from base Build 132625322:	0.0%
Covered Lines:	4070
Relevant Lines:	4438

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💛 - Coveralls

[nickolay]

Nice! I think the point is that a slice is a static constant whereas vec![..] builds the value dynamically?

[Dandandan]

Yes, that's the point. This is a bit more "rusty".

You can also pass a vec to this function, but not a slice to a function expecting a vec.