semver-parser v0.10.1 build failure on stable

[tarcieri]

Strangely, it seems to build on some of my repos but not others.

Pinning to =0.10.0 fixed the problem for me.

error[E0658]: non-builtin inner attributes are unstable
 --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/semver-parser-0.10.1/src/generated.rs:4:1
  |
4 | #![rustfmt::skip]
  | ^^^^^^^^^^^^^^^^^
  |
  = note: for more information, see https://github.com/rust-lang/rust/issues/54726

[djc]

Should this be closed in favor of (reopening) steveklabnik/semver-parser#52?