feat: Add events @opened and @closed

[BerniML]

New showRenderedSuggestions and hideRenderedSuggestions events to facilitate event handling when suggestions appear and disappear

178 enhancement

What: feature #178 enhancement

Help control from the parent component when this suggestions are being shown/hidden, in case any more logic must be applied form the parent.

Checklist:

• [ ] Documentation
• [x] Tests
• [x] Ready to be merged
• [x] Added myself to contributors table

Didn't find how to add this 2 new events in events table of the Readme.md file, is it referenced in another file?

[codecov-io]

Codecov Report

Merging #181 into master will increase coverage by 0.34%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   85.11%   85.46%   +0.34%     
==========================================
  Files           1        1              
  Lines         168      172       +4     
  Branches       47       48       +1     
==========================================
+ Hits          143      147       +4     
  Misses         11       11              
  Partials       14       14              

Impacted Files	Coverage Δ
src/Autosuggest.vue	85.46% <100.00%> (+0.34%)	:arrow_up:

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[darrenjennings]

@BerniML btw, I added an events section very recently, so should be straightforward now on where to add these new events.

[BerniML]

@darrenjennings I made the changes requested:

1. Simplified names for the events
2. Moved the emitters in the isOpen watcher
3. Completed the reame with the new events information