Add CHANGELOG.

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be 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]
+### Changed
+
+- `initialize()` middleware extends request with `login()`, `logIn()`,
+`logout()`, `logOut()`, `isAuthenticated()`, and `isUnauthenticated()`
+functions.
+
+### Removed
+
+- `login()`, `logIn()`, `logout()`, `logOut()`, `isAuthenticated()`, and
+`isUnauthenticated()` functions no longer added to `http.IncomingMessage.prototype`.
+
+### Fixed
+
+- `userProperty` option to `initialize()` middleware only affects the current
+request, rather than all requests processed via singleton Passport instance,
+eliminating a race condition in situations where `initialize()` middleware is
+used multiple times in an application with `userProperty` set to different
+values.