Update the changelog

integrations/pgvector/CHANGELOG.md

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+# Changelog
+
+## [unreleased]
+
+### 🚀 Features
+
+- Defer the database connection to when it's needed (#773)
+
+## [integrations/pgvector-v0.2.0] - 2024-05-08
+
+### 🚀 Features
+
+- `MongoDBAtlasEmbeddingRetriever` (#427)
+- Implement keyword retrieval for pgvector integration (#644)
+
+### 🐛 Bug Fixes
+
+- Fix order of API docs (#447)
+
+This PR will also push the docs to Readme
+
+### 📚 Documentation
+
+- Update category slug (#442)
+- Disable-class-def (#556)
+
+## [integrations/pgvector-v0.1.0] - 2024-02-14
+
+### 🐛 Bug Fixes
+
+- Fix linting (#328)
+
+
+
+<!-- generated by git-cliff -->