build(deps): bump serde_yaml from 0.7.3 to 0.8.4

[dependabot]

Bumps serde_yaml from 0.7.3 to 0.8.4.

Release notes

Sourced from serde_yaml's releases.

0.8.4

• Limit recursion to 128 levels to avoid stack overflows (#105)

0.8.3

• Fix possible panic during deserialization (#101)

0.8.2

• Documentation improvements

0.8.1

• Documentation improvements

0.8.0

• Reduce compile time of Deserialize impls by instantiating fewer Visitor methods when we know the type of data expected (#96)

  This is potentially a breaking change for some handwritten Deserialize impls. For example a Deserialize impl that invokes Deserializer::deserialize_string would no longer deserialize successfully from anything but a string in the input data, even if the Visitor impl otherwise supports types other than string. Deserialize impls that support deserializing from multiple different Serde data types need to use Deserializer::deserialize_any instead.

• Preserve integers as integers when serialized by serde_yaml::to_value (#98)

0.7.5

• More efficient implementation when deserializing ignored fields

0.7.4

• More robust handling of YAML numbers (#88, thanks @​frewsxcv)
• Drop dependency on num-traits

Commits

• c82357a Release 0.8.4
• 800f477 Don't yet use tool attrs because they are not stable
• c52f1cf Fix the recursion limit messages in tests
• 41d5823 Merge pull request #105 from xfix/prevent-too-deep-recursion
• 5911699 Simplify travis setup
• 7ed76cb Bump required version to rustc 1.17
• e73d282 Remove unnecessary quoting around boolean keys
• b93aff6 Prevent too deep recursion
• 49e1e6f Release 0.8.3
• 8fa3e2c Merge pull request #102 from dtolnay/invalid
• Additional commits viewable in compare view

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