Changelog for 0.8

[HeroicKatora]

No description provided.

[fintelia]

If we're going to make a major release, we should probably take the chance to remove the deprecated methods on tiff::decoder::Decoder and check whether there's any other breaking changes worth making

[HeroicKatora]

What about the methods related to read_chunk that require the caller to track current_chunk? Should we already remove those as well or keep them deprecated for a time?

It doesn't seem to critical in that they don't block any effort for writing a decomposed abstraction. However, since we currently don't have it yet, it feels wrong to fully remove them outright.

[fintelia]

I just created #188. It turns out that current_chunk doesn't actually get used anymore, so I think that solves your concern?

[fintelia]

Might be worth unifying Decoder::strip_count and Decoder::tile_count while we have the chance, but otherwise looks good to me