Use different language for approved list of JSON keys.

[kevinmeredith]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1478 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1478      +/-   ##
==========================================
- Coverage   85.94%   85.76%   -0.19%     
==========================================
  Files          57       57              
  Lines        2184     2184              
  Branches      109      109              
==========================================
- Hits         1877     1873       -4     
- Misses        307      311       +4     

Impacted Files	Coverage Δ
...re/shared/src/main/scala/io/circe/JsonNumber.scala	92.77% <0.00%> (-4.82%)	⬇️
...rc/main/scala/io/circe/numbers/BiggerDecimal.scala	85.38% <0.00%> (-1.17%)	⬇️
.../core/shared/src/main/scala/io/circe/Decoder.scala	85.28% <0.00%> (+0.27%)	⬆️
...les/core/shared/src/main/scala/io/circe/Json.scala	80.44% <0.00%> (+0.55%)	⬆️

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[travisbrown]

👍, thank you for doing this, @kevinmeredith.