2.0.0

This release contains the following

• uses vapor/jwt-kit
• removes deprecated methods
• Adds support fort Swift 5.2 removes support for swift 5.1 and 5.0
• Resolves a promise leak in #79
• Allows PEM Password
• Adds other push types, mdm, fileprovider, voip
• updated APNSConnection API
• New enum-style API for configuring auth