Swift 4.2

1.0.4

Increment version to 1.0.4: Swift 4.2 support.

Fixed some warnings

Fixed some remaining warnings of swift 4.1 migration.

Add cocoapod instructions

Added cocoapod instructions to the readme and updated the version.

Cocoapod release

Added a podspec file to make this library available as a cocoapod.

First release

Initial release of a standalone bcrypt algorithm in swift.