Allow encode<T: Encodable>(_ value: T) in JSONSingleValueEncodingContainer

[fabianfett]

fixes #19

[codecov-io]

Codecov Report

Merging #24 into master will increase coverage by 0.08%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   87.87%   87.95%   +0.08%     
==========================================
  Files          31       32       +1     
  Lines        2894     2915      +21     
==========================================
+ Hits         2543     2564      +21     
  Misses        351      351              

Impacted Files	Coverage Δ
...ng/Encoding/JSONSingleValueEncodingContainer.swift	50.00% <87.50%> (+11.11%)	⬆️
...coding/JSONSingleValueEncodingContainerTests.swift	100.00% <100.00%> (ø)

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[adam-fowler]

Looks good