This is pgx v0.2.4. It resolves (as best as possible) a compilation performance regression (#287) by only compiling the sql-generator binary when it's required. It also adds a few more Postgres headers for additional bindings around time/date and non-UTF8 encodings (PR #289).
Please make sure to run cargo install cargo-pgx along with updating your extension's Cargo.toml dependencies to point to this version.