Update Readme, Changelog, summary

Author: esotericpig

CHANGELOG.md

@@ -1,33 +1,34 @@
 # Changelog | InitCopy
 
-All notable changes to this project will be documented in this file.
+- [Keep a Changelog](https://keepachangelog.com/en/1.1.0)
+- [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 
-Format is based on [Keep a Changelog v1.0.0](https://keepachangelog.com/en/1.0.0),
-and this project adheres to [Semantic Versioning v2.0.0](https://semver.org/spec/v2.0.0.html).
+## [Unreleased]
 
-## [[Unreleased]](https://github.com/esotericpig/init_copy/compare/v0.1.2...HEAD)
--
+## [0.2.0] - 2025-06-05
+### Changed
+- Major change to simplify usage.
+  - Must include `InitCopy` in your class/module, override `init_copy(orig)`, and use `ic_copy(var)` instead of clone/dup.
+  - Renamed `safe_copy(var)` to `ic_copy?(var)`. (Most users will probably not use this method anyway.)
+- Refactored unit tests to reflect new changes.
+- Changed doc from `yard` to `rdoc`.
+- Renamed git branch `master` to `main`.
+
+### Removed
+- Major change to drop support for `Copier`/`Copyer`, which relied on `caller`.
+- Dropped `Copiable` alias.
 
+### Fixed
+- Applied new RuboCop suggestions for Gemspec, Gemfile, code, etc.
 
-## [v0.1.2] - 2021-06-18
+## [0.1.2] - 2021-06-18
 ### Changed
 - Formatted code with RuboCop.
 
-
-## [v0.1.1] - 2020-03-07
+## [0.1.1] - 2020-03-07
 ### Fixed
 - Added `initialize` to the mixin (Copyable) to define a default value to `@init_copy_method_name` so not `nil`.
-    - This wasn't necessary, but adding Justin Case.
-
-
-## [v0.1.0] - 2020-03-06
-### Added
-- .gitignore
-- CHANGELOG.md
-- Gemfile
-- init_copy.gemspec
-- LICENSE.txt
-- Rakefile
-- README.md
-- lib/init_copy.rb
-- test/init_copy_test.rb
+  - This wasn't necessary, but added Justin Case.
+
+## [0.1.0] - 2020-03-06
+Initial release.