Encoding fixes.

[fabianfett]

Thanks so much @adam-fowler.

This shall fix #21 and #19.

[codecov-io]

Codecov Report

Merging #25 into master will increase coverage by 0.83%.
The diff coverage is 95.85%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   87.97%   88.80%   +0.83%     
==========================================
  Files          32       34       +2     
  Lines        2918     3074     +156     
==========================================
+ Hits         2567     2730     +163     
+ Misses        351      344       -7     

Impacted Files	Coverage Δ
...s/Encoding/JSONUnkeyedEncodingContainerTests.swift	94.28% <94.28%> (ø)
...ts/JSONCodingTests/Encoding/JSONEncoderTests.swift	87.69% <95.00%> (+3.24%)	⬆️
...sts/Encoding/JSONKeyedEncodingContainerTests.swift	95.12% <95.12%> (ø)
...ces/PureSwiftJSONCoding/Encoding/JSONEncoder.swift	91.30% <95.91%> (+6.68%)	⬆️
...ONCoding/Encoding/JSONKeyedEncodingContainer.swift	55.00% <100.00%> (+19.00%)	⬆️
...Coding/Encoding/JSONUnkeyedEncodingContainer.swift	46.55% <100.00%> (+25.71%)	⬆️

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