af: release 1.2.0

[stevehobbsdev]

This release adds official support for the Web platform! 🎉 Please checkout the readme for full usage instructions for all supported platforms:

Other changes in this release:

Added

• Add support for requesting MFA challenges [SDK-4052] #251 (Widcket)

Fixed

• Use Locale.US for Android #238 (Mecharyry)