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/).
+
+## [0.2] - 2021-07-06
+### Added
+ - An optional macro parameter `visit_macros` was added to control whether literals inside of macro invocations should be replaced. See the readme or docs for an example.
+### Changed
+ - By default, literals are now also replaced inside of macro invocations
+### Fixed
+ - Integer literals with float suffixes (e.g. `1_f64`) are now correctly identified as floats and replaced accordingly
+
+## [0.1.1] - 2019-11-26
+
+### Internal
+ - Updated `syn` and `quote` to version 1.0
+
+## [0.1] - 2021-05-19
+
+Initial release.