Bump serde from 1.0.207 to 1.0.208

Bumps serde from 1.0.207 to 1.0.208.

Release notes

Sourced from serde's releases.

v1.0.208

• Support serializing and deserializing unit structs in a flatten field (#2802, thanks @​jonhoo)

Commits

• 026e91a Release 1.0.208
• bfbedac Merge pull request #2802 from jonhoo/flatten-unit-struct
• 4036ff8 Support (de-)serializing flattened unit struct
• See full diff in compare view

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