0.6.0

[Breaking changes]

• Remove Crashes APIs related to attachments as it's not supported by backend yet.
• Crashes.LastSessionCrashReport property becomes Crashes.GetLastSessionCrashReportAsync() async method.

[Bug fixes]

• Include underlying iOS SDK changes from the following releases:
  • https://github.com/Microsoft/mobile-center-sdk-ios/releases/tag/0.3.7
  • https://github.com/Microsoft/mobile-center-sdk-ios/releases/tag/0.3.6
  • https://github.com/Microsoft/mobile-center-sdk-ios/releases/tag/0.3.5
• Include underlying Android SDK changes from the following releases:
  • https://github.com/Microsoft/mobile-center-sdk-android/releases/tag/0.5.0
  • https://github.com/Microsoft/mobile-center-sdk-android/releases/tag/0.4.0