Version 2 was released in October 2016 and brought many enhancements including introducing the well-loved CLI and JWT generating functionality.
Version 3 was
released in February 2017 and introduced automatic schema exporting (in both
GraphQL and JSON formats), schema watching, and changed the default global node
Version 4 replaced 80% of the codebase with the new Graphile Engine core, focussing on lower latency, higher performance and greater extensibility whilst maintaining as much compatibility with version 3 as possible. Due to trademark concerns, version 4 also introduces a rename of the project from PostGraphQL to PostGraphile.
But version 4 is not the end of PostGraphile's history — there's lots more to come...