Feature/ bulk request

[prafsoni]

• (Bulk API Support #48) add BulkRequest support.
• Travis Linux Build with swift-5.1.2-RELEASE

[codecov]

Codecov Report

Merging #63 into master will increase coverage by 1.21%.
The diff coverage is 72.48%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
+ Coverage   37.71%   38.93%   +1.21%     
==========================================
  Files          52       53       +1     
  Lines        5504     5638     +134     
==========================================
+ Hits         2076     2195     +119     
- Misses       3428     3443      +15

Impacted Files	Coverage Δ
Sources/ElasticSwift/Utils/Utils.swift	28.57% <0%> (+11.9%)	⬆️
Sources/ElasticSwift/Requests/UpdateRequest.swift	65.1% <100%> (+2.51%)	⬆️
Sources/ElasticSwift/Requests/DeleteRequest.swift	79.1% <100%> (+6.79%)	⬆️
Sources/ElasticSwift/Requests/IndexRequest.swift	70.75% <60%> (+0.94%)	⬆️
Sources/ElasticSwift/Requests/BlukRequest.swift	71.84% <71.84%> (ø)
Sources/ElasticSwift/ElasticSwift.swift	52% <75%> (+1.29%)	⬆️
Sources/ElasticSwift/Responses/Response.swift	80.7% <88.23%> (+3.2%)	⬆️
.../ElasticSwiftNetworkingNIO/HTTPClientAdaptor.swift	88.57% <0%> (+2.85%)	⬆️
... and 4 more

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