String format specifier for unsigned int not working

[Evgenii Vandyshev]

String Plural with NSStringFormatValueTypeKey equal u generates a func with Int argument. There should be UInt.

SwiftGen/Sources/SwiftGenKit/Parsers/Strings/PlaceholderType.swift

Lines 27 to 28 in 1cf6d7e

 case "d", "i", "o", "u", "x": 
   self = .int 

https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFStrings/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265