Add changelog.yml and a copy of old CHANGELOG.md

CHANGELOG.old.md

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+# v0.3.0 2019-11-07
+
+### Changed
+
+- [BREAKING] Dropped support for Ruby < 2.4
+
+### Added
+
+- Memoization option for immutable objects. If `immutable: true` is passed the result of `.hash` call will be memoized after its first invocation or on `.freeze` call (skryukov)
+  ```ruby
+  class User
+    include Dry::Equalizer(:id, :name, :age, immutable: true)
+  end
+  ```
+
+[Compare v0.2.2...v0.3.0](https://github.com/dry-rb/dry-equalizer/compare/v0.2.2...v0.3.0)
+
+# v0.2.2 2019-03-08
+
+### Added
+
+- Generation of `#to_s` and `#inspect` can be disabled with `inspect: false` (flash-gordon)
+  ```ruby
+  class User
+    include Dry::Equalizer(:id, :name, :age, inspect: false)
+  end
+  ```
+
+[Compare v0.2.1...v0.2.2](https://github.com/dry-rb/dry-equalizer/compare/v0.2.1...v0.2.2)
+
+# v0.2.1 2018-04-26
+
+### Fixed
+
+- Including equalizer module with same keys multiple times won't cause duped keys in `inspect` output (radar)
+
+[Compare v0.2.0...v0.2.1](https://github.com/dry-rb/dry-equalizer/compare/v0.2.0...v0.2.1)
+
+# v0.2.0 2015-11-13
+
+Really make it work with MRI 2.0 again (it's Friday 13th OK?!)
+
+# v0.1.1 2015-11-13
+
+Make it work with MRI 2.0 again
+
+# v0.1.0 2015-11-11
+
+## Added
+
+- `Dry::Equalizer()` method accepting a list of keys (solnic)
+
+## Changed
+
+- `eql?` no longer tries to coerce `other` with `coerce` method (solnic)

changelog.yml

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+---
+- version: 0.3.0
+  date: '2019-11-07'
+  changed:
+  - "[BREAKING] Dropped support for Ruby < 2.4"
+  added:
+  - |-
+    Memoization option for immutable objects. If `immutable: true` is passed the result of `.hash` call will be memoized after its first invocation or on `.freeze` call (skryukov)
+      ```ruby
+      class User
+        include Dry::Equalizer(:id, :name, :age, immutable: true)
+      end
+      ```
+- version: 0.2.2
+  date: '2019-03-08'
+  added:
+  - |-
+    Generation of `#to_s` and `#inspect` can be disabled with `inspect: false` (flash-gordon)
+      ```ruby
+      class User
+        include Dry::Equalizer(:id, :name, :age, inspect: false)
+      end
+      ```
+- version: 0.2.1
+  date: '2018-04-26'
+  fixed:
+  - Including equalizer module with same keys multiple times won't cause duped keys
+    in `inspect` output (radar)
+- version: 0.2.0
+  date: '2015-11-13'
+  summary: Really make it work with MRI 2.0 again (it's Friday 13th OK?!)
+- version: 0.1.1
+  date: '2015-11-13'
+  summary: Make it work with MRI 2.0 again
+- version: 0.1.0
+  date: '2015-11-11'
+  added:
+  - "`Dry::Equalizer()` method accepting a list of keys (solnic)"
+  changed:
+  - "`eql?` no longer tries to coerce `other` with `coerce` method (solnic)"