Add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to the standback project will be documented in this file.
+
+The format is based on [Keep a Changelog]. This project adheres to [Semantic
+Versioning].
+
+---
+
+## Unreleased
+
+Nothing yet.
+
+## 0.2.4 [2020-04-20]
+
+- `TryFrom` identity is implemented for some primitives.
+- `TryFrom`, `TryInto` and correctly re-exported.
+- `TryFromIntError` has been moved to `mod num`.
+
+## 0.2.3 [2020-04-18]
+
+Embedded and `#![no_std]` now have full support and are checked in CI.
+
+## 0.2.2 [2020-04-02]
+
+The version of rustc being used will now respect the $RUSTC environment
+variable.
+
+## 0.2.1 [2020-03-13]
+
+Support for Rust 1.42.0 APIs has been added.
+
+## 0.2.0 [2020-03-10]
+
+- `MaybeUninit` is restricted to `Copy` types, eliminating undefined behavior.
+- `todo!` has been moved to the prelude.
+
+## 0.1.0 [2020-03-05]
+
+Initial release.