cached_proc_macro-v3.0.1

What's Changed

• Pin the cargo-readme version CI installs by @jaemk in #321
• Correct the extreme-ttl doc claims about the sharded stores by @jaemk in #322
• Add ClaimRegistry: a single-flight guard for background refreshes by @jaemk in #323
• Capability traits, and borrowed keys on the sharded lookups by @jaemk in #324
• keep the generated clone inside the macro expansion so nightly clippy's clone_on_copy stays quiet by @raimannma in #325
• guard the generated clone's syntax context on nightly by @jaemk in #326
• release 4.0.0 / cached_proc_macro 3.0.1 by @jaemk in #327

Full Changelog: v3.1.1...cached_proc_macro-v3.0.1