Noticed while reviewing the new Reqnroll xunit v3 plugin, but it's an existing issue copied from the current Reqnroll plugin. The nuspec targets a specific xRetry version, but we no longer release them all in-step. This is likely a hang-over from the old versioning where all plugins got released every time.
Problem is: we might release v1.0.0 of xRetry.v3, and v1.0.0 of xRetry.Reqnroll.v3, and then later release a fix for xRetry.v3 as v1.0.1. Reqnroll users would be prevented from upgrading xRetry.v3, and getting the fix. The nuspec constraints should probably be loosened to allow upgrades within the same major version.