0.3.0

• Update all dependencies to current versions.
• (Breaking) Drop support for Clojure 1.7-1.9. Minimum is now Clojure 1.10.
• (Breaking) Require nREPL 1.0+.
• (Breaking) Require Java 17+ (Ring 1.15 uses Jetty 12).
• Fix client transport to keywordize JSON response keys for compatibility with nREPL 1.x.
• Expand test suite with comprehensive Ring handler and HTTP client transport tests.