Bump serde from 1.0.97 to 1.0.98

[dependabot-preview[bot]]

Bumps serde from 1.0.97 to 1.0.98.

Release notes

*Sourced from [serde's releases](https://github.com/serde-rs/serde/releases).* > ## v1.0.98 > - Add support for NonZeroI* types ([#1589](https://github-redirect.dependabot.com/serde-rs/serde/issues/1589), thanks [@​Flaise](https://github.com/Flaise))

Commits

- [`690467c`](https://github.com/serde-rs/serde/commit/690467cbe2bc3bf856511813fb335812691b1494) Release 1.0.98 - [`71efd8f`](https://github.com/serde-rs/serde/commit/71efd8ffda6e9baa1652c52731e0e6d35a051b78) Merge pull request [#1590](https://github-redirect.dependabot.com/serde-rs/serde/issues/1590) from dtolnay/manifest - [`9bb196a`](https://github.com/serde-rs/serde/commit/9bb196ae6eb64aead633cdb02eabb1636282e38e) Work around failing to parse manifest in 1.27 and 1.28 builds - [`ce75418`](https://github.com/serde-rs/serde/commit/ce75418e40a593fc5c0902cbf4a45305a4178dd7) Merge pull request [#1589](https://github-redirect.dependabot.com/serde-rs/serde/issues/1589) from Flaise/nonzeroi - [`78c7f09`](https://github.com/serde-rs/serde/commit/78c7f09e28df6550c8bae5e04c86a1b5202d6a1e) Add build gate for nonzero signed integers so rustc <1.34 still works - [`e7269ac`](https://github.com/serde-rs/serde/commit/e7269ac84e7f8c73bd8556215dabefcc0a42a142) Add travis builds on every version in build.rs - [`34866e2`](https://github.com/serde-rs/serde/commit/34866e20a832950188105a2ac51f1636007bf509) Add support for NonZeroI* types - See full diff in [compare view](https://github.com/serde-rs/serde/compare/v1.0.97...v1.0.98)

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Superseded by #17.