bump dependency versions to the minimum version that compiles. #428
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The dependency versions in Cargo.toml were inaccurate in places, because they allowed versions that don't actually work-- crates were enabling Cargo features that don't exist in those versions, or methods/traits/etc that didn't exist in the code.
This allows a tool like
cargo minimal-versions
to verify that the code compiles even when using the oldest possible dependency versions, but is also a useful step toward verifying that the crates can be built on older toolchains.Replaces #419.