Remove unused code.

Author: Ken Carroll

Source/Shared/Storage/DiskStorage.swift

@@ -17,7 +17,6 @@ final public class DiskStorage<Key: Hashable, Value> {
 
   private let transformer: Transformer<Value>
   private let hasher = Hasher.constantAccrossExecutions()
-//    private var defaultFileAttributes: [FileAttributeKey : Any]?
 
   // MARK: - Initialization
   public convenience init(config: DiskConfig, fileManager: FileManager = FileManager.default, transformer: Transformer<Value>) throws {
@@ -84,9 +83,6 @@ extension DiskStorage: StorageAware {
     let expiry = expiry ?? config.expiry
     let data = try transformer.toData(object)
     let filePath = makeFilePath(for: key)
-//      var attributes = defaultFileAttributes!
-//      attributes[.modificationDate] = expiry.date
-//      
     _ = fileManager.createFile(atPath: filePath, contents: data, attributes: nil)
     try fileManager.setAttributes([.modificationDate: expiry.date], ofItemAtPath: filePath)
   }