Deprecated filesystem APIs

[peterflynn]

This extension uses APIs which are deprecated as of Brackets Sprint 34 (the next release):

• NativeFileSystem.FileEntry
• NativeFileSystem.resolveNativeFileSystemPath()
• DirectoryEntry.createReader()

[iwehrman]

Fixed by 9b28d9e. Thanks for the report, @peterflynn!

[joelrbrandt]

🤘 🤘