Fix linting

Author: danielsaidi

Sources/SwiftUIKit/Date/JSONEncoder+Date.swift

@@ -21,7 +21,7 @@ public extension JSONEncoder {
 private extension JSONEncoder.DateEncodingStrategy {
 
     /// A strategy that can encode ISO8601 dates robustly.
-    static let customISO8601 = custom { (date, encoder) throws -> Void in
+    static let customISO8601 = custom { (date, encoder) throws in
         let formatter = DateFormatter.iso8601Milliseconds
         let string = formatter.string(from: date)
         var container = encoder.singleValueContainer()