v3.0.1-rc2

What's Changed

• refactor(client): rename as_mut to update for clarity and consistency by @0x676e67 in #482
• tests: added client headers update test by @0x676e67 in #483
• tests: Add client emulation update test by @0x676e67 in #484
• tests: Add client cloned test by @0x676e67 in #485
• build: fix docs build by @0x676e67 in #486

Full Changelog: v3.0.1-rc1...v3.0.1-rc2