Update scoped slot suggestion template

[jhalag]

Update template example to use Vue 2.60+ syntax. See https://vuejs.org/v2/guide/components-slots.html#Scoped-Slots
(cherry picked from commit a9cfc7e)

[coveralls]

Pull Request Test Coverage Report for Build 64

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.388%

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Totals
Change from base Build 38:	0.0%
Covered Lines:	47
Relevant Lines:	68

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💛 - Coveralls

[mattzollinhofer]

I'm just plowing through the obvious problems right now to get those fixed/merged. This is a good idea, but I'll need some time to determine the impact of this change. I'm still somewhat new to Vue and don't fully understand the impacts of changes across versions.

This looks like a positive change on the surface so I'll definitely take a look at this PR again, hopefully soon.

Please do chime in if you can educate me about and dangers of conflict (or that I shouldn't be worrying about it 😄 ) either here or on the new repo: https://github.com/mattzollinhofer/vue-typeahead-bootstrap/

[mattzollinhofer]

This is fine, but not something I want to take on for the moment.