v1.2.0

Minor release: expands the read-only gh allowlist, plus docs improvements.

• feat: auto-approve read-only gh reads (run watch / search / api GET) by @karlkfi in #17
• docs: document plugin upgrade procedure by @karlkfi in #15
• docs: correct marketplace name in /plugin commands by @karlkfi in #16

Full Changelog: v1.1.0...v1.2.0