JSONValue.debugDataTypeDescription is internal now

[fabianfett]

Fixes #38

[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   90.76%   90.76%           
=======================================
  Files          39       39           
  Lines        3301     3301           
=======================================
  Hits         2996     2996           
  Misses        305      305           

Impacted Files	Coverage Δ
Sources/PureSwiftJSON/Decoding/JSONDecoder.swift	100.00% <ø> (ø)
Sources/PureSwiftJSON/JSONValue.swift	94.64% <100.00%> (ø)

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