Switch to thiserror (BREAKING) #9
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error-chain is declining in popularity. It also, more importantly, does not implement Sync on its errors. This causes issues with popular parts of the ecosystem such as anyhow. thiserror is a minimal alternative to error-chain that fulfills this crate's needs, and implements Sync. However, error-chain is exposed in the public API, making this a breaking change. I bumped the crate version to 0.6.0.