Add response decoding using Decodable

[guilhermearaujo]

As requested on #93

[guilhermearaujo]

There seems to be a flaky test that fails eventually when I run them locally:

Test Case '-[Malibu_macOS_Tests.JsonEncoderSpec JsonEncoder___encode_parameters__encodes_a_dictionary_of_parameters_to_NSData_object]' started.
./MalibuTests/Specs/Encoding/JsonEncoderSpec.swift:22: error: -[Malibu_macOS_Tests.JsonEncoderSpec JsonEncoder___encode_parameters__encodes_a_dictionary_of_parameters_to_NSData_object] : expected to equal <Data<hash=115512365,length=37>>, got <Data<hash=125446637,length=37>>

Most of the attempts succeed, though. An identical Travis job on my fork also passed.

[vadymmarkov]

@guilhermearaujo Thanks for the PR! Left one comment, other than that looks great.

[vadymmarkov]

How about:

fun decode<U: Decodable>(_ type: U.Type, using decoder: JSONDecoder = JSONDecoder()) {
    // ...
}

Then you can pass your custom decoder configured with data and date decoding strategy if needed.

[guilhermearaujo]

That's a good idea, I'll change it.

[vadymmarkov]

That flaky test can be fixed in a separate PR I think.

[codecov-io]

Codecov Report

Merging #113 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   92.58%   92.73%   +0.15%     
==========================================
  Files          62       64       +2     
  Lines        3046     3110      +64     
==========================================
+ Hits         2820     2884      +64     
  Misses        226      226

Impacted Files	Coverage Δ
Sources/NetworkError.swift	91.17% <100%> (+0.55%)	⬆️
...ibuTests/Specs/Response/ResponseDecodingSpec.swift	100% <100%> (ø)
Sources/Response/ResponseDecoding.swift	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cdb400e...fdea449. Read the comment docs.

[vadymmarkov]

Awesome. Thanks @guilhermearaujo 👏