Getting v3 ready!

[AdrieanKhisbe]

Include work on setting up a promise api

More details to be added

[codecov]

Codecov Report

Merging #2 into master will increase coverage by 32.60%.
The diff coverage is 78.88%.

@@             Coverage Diff             @@
##           master       #2       +/-   ##
===========================================
+ Coverage    8.52%   41.12%   +32.60%     
===========================================
  Files          19       18        -1     
  Lines         704      552      -152     
===========================================
+ Hits           60      227      +167     
+ Misses        644      325      -319     

Impacted Files	Coverage Δ
src/api/metric.js	58.33% <57.14%> (+7.05%)	⬆️
src/api/downtime.js	25.00% <63.15%> (+25.00%)	⬆️
src/api/monitor.js	32.58% <63.15%> (+32.58%)	⬆️
src/api/host.js	43.47% <71.42%> (+43.47%)	⬆️
src/datadog.js	78.57% <75.00%> (ø)
src/api/comment.js	31.42% <80.00%> (+31.42%)	⬆️
src/api/service-check.js	57.89% <83.33%> (+57.89%)	⬆️
src/api/screenboard.js	40.90% <84.61%> (+40.90%)	⬆️
src/api-client.js	85.00% <85.00%> (ø)
src/api/tag.js	40.42% <93.75%> (+40.42%)	⬆️
... and 10 more

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