v1.13.0

JSON3 v1.13.0

Diff since v1.12.0

Closed issues:

• Unable to write negative big integers (#242)
• Alternative to wrapper types? (#254)
• Serializing/deserializing nulls vs. empty vectors (#255)

Merged pull requests:

• Read files directly (#243) (@onetonfoot)
• Fix writing of BigInts (#244) (@quinnj)
• can now do read(::Cmd, ::Type) (#252) (@eugene-shvarts)
• Fix writing when array has undef values (#253) (@quinnj)
• Migrate from SnoopPrecompile to PrecompileTools (#256) (@timholy)
• Clarify StructTypes.AbstractType(), the role of Julia types in dispatch (#257) (@freemin7)