Xcode 10.2 & Swift 5.0

Merge pull request #8 from appunite/xcode10.2

Updated to Swift 5

Use single URLSession

Merge pull request #6 from appunite/use-single-session

Use single session

Thread-safe array

0.3.0

Provide type-safe indexing

Fix crash

0.2.3

Fix crash

Specify downloads directory

0.2.2

Add feature of downloads directory specifying

Small fixes

Merge pull request #5 from appunite/setup-travis

Setup travis

0.2.0

Fix macos

First release!

0.1.0

Add file remove tests