2.1.0 - Update deployment versions & switch to SwiftlyLogging

Enhancements

• Updating minimum deployment versions to be more compatible with current tooling
  • iOS - "12.0"
  • OSX - "11.0"
  • tvOS - "12.0"
  • watchOS - "8.0"
• Updated Swift Version to 5.8
• Switched from Logging pod to SwiftlyLogging pod
  • Same code, just updated podspecs and continuing cocoapod support (for now)