3.0.0 Beta 3

• Enabled base internationalisation to silence a warning (#119)
• Migrates tests to Swift 5 (#138)
• New identity changes (#133):
  • The .createAlias() method is no longer required, use .identify() instead
  • .identify() will create an alias if being called from an anonymous ID generated by RevenueCat
  • Added an isAnonymous property to Purchases.shared
  • Improved offline use