Merge pull request JohnSundell#80 from JohnSundell/relative-paths

Add API for computing a path relative to a parent folder

README: Update for Swift 5.0

Merge pull request JohnSundell#77 from JohnSundell/remove-deprecated-api

Remove deprecated ‘creatingSubfolderFailed’ API

Merge pull request JohnSundell#53 from iainsmith/4.0

Add support for Swift 4.0 & update CI

Merge pull request JohnSundell#52 from krzyzanowskim/master

Set Swift 4.1. Remove Linux ObjCBool extension

Merge pull request JohnSundell#49 from ikhsan/master

Add append to file

Merge pull request JohnSundell#37 from JohnSundell/swift4-package-des…

…cription

Use Swift 4 version of the Package Description API

README: Add BuddyBuild, Marathon & Swift version badges

Merge pull request JohnSundell#24 from artemnovichkov/master

Add copy function for item

Merge pull request JohnSundell#21 from clayellis/master

Move hidden folder contents