feat(class) add ul and li class props

[darrenjennings]

Adds ability to specify liClass and ulClass in sections:

e.g.

sectionConfigs: {
  default: {
    limit: 4,
    ulClass: {'a-class-name-here': true },
    // applies to all `<li>` in default sections
    liClass: {'default-row': true }
  },
  Elf: {
    limit: 6,
    liClass: {'elf-row': true }
  }
},

Or if your item has a liClass on it, it will be used:

:suggestions="options"

options = [{id: 1, name: 'Gandalf', liClass: 'Gandalf'}]

Fixes #90

[codecov-io]

Codecov Report

Merging #165 into master will increase coverage by 1.78%. The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   83.33%   85.11%   +1.78%     
==========================================
  Files           1        1              
  Lines         168      168              
  Branches       48       47       -1     
==========================================
+ Hits          140      143       +3     
+ Misses         12       11       -1     
+ Partials       16       14       -2

Impacted Files	Coverage Δ
src/Autosuggest.vue	85.11% <87.5%> (+1.78%)	:arrow_up:

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[Maybach91]

Can please update the documentation according to this?