2.1.0 - login fix

If you installed xcodes with homebrew you can upgrade with brew upgrade xcodesorg/made/xcodes.

Fixes 404 login issue

Apple has changed how they log in (again).

Changes

• update xcodesKit and XcodesLoginKit (#492) @MattKiazyk
• Fixed a type in the README.md (#489) @skeswa, @MattKiazyk