Bump serde from 1.0.202 to 1.0.203

Bumps serde from 1.0.202 to 1.0.203.

Release notes

Sourced from serde's releases.

v1.0.203

• Documentation improvements (#2747)

Commits

• d5bc546 Release 1.0.203
• 45ae217 Merge pull request #2747 from dtolnay/variadic
• b7b97dd Unindent implementation inside tuple_impl_body macro
• 5d3c563 Document tuple impls as fake variadic
• 3761854 Merge pull request #2745 from dtolnay/docsrs
• a8f1484 Rely on docs.rs to define --cfg=docsrs by default
• See full diff in compare view

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