Package - Swift Language Versions #8
Description
The Package.swift file should indicate the languages of Swift that is supports Apple Doc
It appears that your package supports Swift 4, 5 so you should update the Package.swift with this line
swiftLanguageVersions: [4, 5]This should silence the warning
'Hashable.hashValue' is deprecated as a protocol requirement; conform type 'JSONPointer' to 'Hashable' by implementing 'hash(into:)' instead