Create CHANGELOG.md

Author: nsaunders

CHANGELOG.md

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+# Changelog
+
+Notable changes are documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+Breaking changes:
+
+New features:
+
+Bugfixes:
+
+Other improvements:
+
+## [2.0.0] - 2023-02-10
+
+Breaking changes:
+- Updated to v0.15 of the compiler, dropping support for previous versions. (#5 by @nsaunders)
+- New API drops the `<:` operator. Instead, `fromEnv` looks up the environment variable name corresponding to each row label. (#6 by @nsaunders)
+- Support for accumulating multiple errors (#3 by @johncowie)
+- Accumulate errors in a `List EnvError`, eliminating the need for an `EnvErrors` constructor. (#8 by @nsaunders)
+- Update `fromEnv` to accept a record type instead of a row type (#10 by @nsaunders)
+
+Other improvements:
+- Better performance via Record Builder (#9 by @nsaunders)
+- Updated code examples in the README (#7 and [a9eaa73](https://github.com/nsaunders/purescript-typedenv/commit/a9eaa7369e61a3e2b0606a3aac21787ff64b4e52) by @nsaunders)
+- Clarify source module for `note` function (#1 by @srghma)
+
+## [1.0.0] - 2021-03-27
+
+Breaking changes:
+- Updated to v0.14 of the compiler, dropping support for previous versions. ([452b2b8](https://github.com/nsaunders/purescript-typedenv/commit/452b2b81d58e7b5e8daee288606663a7a554268e) by @nsaunders)
+
+Other improvements:
+- Various documentation updates.
+
+## [0.0.1] - 2019-09-07
+
+Initial release