[sentry_flutter] sentry_flutter only one version in 'pub.dev'

[chvin]

sentry_flutter versions: https://pub.dev/packages/sentry_flutter/versions
Only 1 version: 4.0.0-alpha.2. Alpha meaning not safe.I can't use safe 3.x version

Compare dio versions: https://pub.dev/packages/dio/versions
Dio has all versions.

[marandaneto]

@chvin sentry_flutter is a new package and it's built on top of the https://pub.dev/packages/sentry/versions package, which does have more versions.

our docs https://docs.sentry.io/platforms/flutter/ mention that this is a Prerelease, also its released under a Prerelease tag on pub.dev and also GH releases, how can we make it clearer that this is indeed, a Prerelease?

so feel free to wait a bit more and use once it's GA.