Add changelog

Author: benjaminran

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Changed
+- `pinecone.init()` can now be used to set the pinecone logger's log level.
+
+## [2.0.0] - 2020-10-04
+### Added
+- New major release!
+
+### Changed
+- `pinecone.create_index()` now requires a `dimension` parameter.
+- The `pinecone.Index` interface has changed:
+  - `Index.upsert`, `Index.query`, `Index.fetch`, and `Index.delete` now take different parameters and return different results.
+  - `Index.info` has been removed. See `Index.describe_index_stats()` as an alternative.
+  - The `Index()` constructor no longer validates index existence. This is instead done on all operations executed using the Index instance.
+
+
+[Unreleased]: https://github.com/pinecone-io/pinecone-python-client/compare/v2.0.1...HEAD
+[2.0.1]: https://github.com/pinecone-io/pinecone-python-client/compare/v2.0.0...v2.0.1
+[2.0.0]: https://github.com/pinecone-io/pinecone-python-client/compare/v2.0.0...v2.0.1