[FEATURE] Allow to use pre-release version

[ampersanda]

Is your feature request related to a problem? Please describe.
I tried to implement Video Calling feature for Android, iOS and Web, but sadly the web doesn't want to be compiled and got dart:ffi errors when doing that.

Describe the solution you'd like

• Allow to use pre-release version
• Allow running without crashing compilation for the web

Describe alternatives you've considered
Since pre-release is listed in the readme file, I considered this as temporary solution for my project. How should I do that?

Additional context

[ampersanda]

temporarily solution I found, in fact it's not the compilation, but in the barrel file that I have

export 'utils/agora/unsupported_agora_rtc_utils.dart'
    if (dart.library.ffi) 'utils/agora/agora_rtc_utils.dart';

solves my problem