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98f3258ff4
We discussed the idea of adding a livecheck strategy to check crate versions years ago but decided to put it off because it would have only applied to one formula at the time (and it wasn't clear that a crate was necessary in that case). We now have a few formulae that use a crate in the `stable` URL (`cargo-llvm-cov`, `pngquant`, `oakc`) and another formula with a crate resource (`deno`), so there's some value to the idea now. I established a standard approach for checking crate versions in a somewhat recent `pngquant` `livecheck` block update and this commit reworks it into a strategy, so we won't have to duplicate that `livecheck` block in these cases. With this strategy, we usually won't even need a `livecheck` block at all. Under normal circumstances, a regex and/or strategy block shouldn't be necessary but the strategy supports them when needed. The response from the crates.io API is a JSON object, so this uses `Json#versions_from_content` internally and a `strategy` block will receive the parsed `json` object and a regex (the strategy default or the regex from the `livecheck` block).