docs: update README with PostgreSQL 18 and role management features #69
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Summary
Updates README.md documentation to reflect current PostgreSQL version support and documents the new role management features.
Changes
PostgreSQL version updates
New documentation section
Context
The README contained outdated references to PostgreSQL 12 as the "latest version", which needed updating to reflect support for PostgreSQL 18. Additionally, the newly added role management features (r1/r2) from PR #68 were not documented in the README.