fix invalid use of old FileManager.defaultInstance in NSTask.swift
diff --git a/Foundation/NSTask.swift b/Foundation/NSTask.swift
index ecb1f4b..fb0276d 100644
--- a/Foundation/NSTask.swift
+++ b/Foundation/NSTask.swift
@@ -152,7 +152,7 @@
open var arguments: [String]?
open var environment: [String : String]? // if not set, use current
- open var currentDirectoryPath: String = FileManager.defaultInstance.currentDirectoryPath
+ open var currentDirectoryPath: String = FileManager.default.currentDirectoryPath
// standard I/O channels; could be either an NSFileHandle or an NSPipe
open var standardInput: AnyObject? {