# Functions
New returns a new subscription.
NewBoltRepository initializes a new repository.
NewRedisRepository initializes a new repository.
# Constants
BoltDBFile is the filename to store the boltdb database.
BucketName is the bucket name to store the invitations on the bolt db.
# Structs
Subscription is a tuple that can be used to identify a mailing list user.
# Interfaces
Repository is the interface that needs to be implemented by subscription storage.