Suppress false positive in current clippy nightly

[jonasbb]

rust-lang/rust-clippy#7422

[codecov]

Codecov Report

Merging #334 (3f692f2) into master (8ed16d7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #334   +/-   ##
=======================================
  Coverage   77.85%   77.85%           
=======================================
  Files          45       45           
  Lines        2628     2628           
=======================================
  Hits         2046     2046           
  Misses        582      582           

Impacted Files	Coverage Δ
serde_with_macros/src/lib.rs	0.00% <ø> (ø)
serde_with_macros/tests/version_numbers.rs	100.00% <ø> (ø)
tests/version_numbers.rs	79.31% <ø> (ø)

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[jonasbb]

bors r+

[bors]

Build succeeded:

• Rustsec Audit
• Tests result