vcrpy 4.1.0 changelog missing an important bugfix note

[vEpiphyte]

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The PR to add aiohttp cookie support (#536) contained a change in how responses are handled when they are missing from a write protected cassette in ba9105348521b8d63e6798df8dcc9d91aad81cf3 . This bugfix exposes incorrect use of vcrpy cassetes, but is not currently documented as far as I can tell.

I'm raising this issue since my team had several nightly build failures for projects over the weekend due to this changed behavior, so it would be good to note.