Add changelog

Author: JonRowe

CHANGELOG.md

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+### Development
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.2.0...main)
+
+### 1.2.0 / 2023-12-10
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.1.0...v1.2.0)
+
+Enhancements:
+
+* Rails 7+ support. (Jon Rowe, #56)
+* Rails 6+ support, (Jon Rowe, #50)
+
+Bug fixes:
+
+* mock_model stubs `===` on the klass to ensure case equality works. (Jon Rowe, #55)
+* Prefer File.exist? to avoid deprecation. (Olle Jonsson, #49)
+* Add missing project metadata to the gemspec. (Orien Madgwick, #34)
+* Make `blank?` behave like (be mocked like) `empty?`. (@lulalala, #29)
+
+### 1.1.0 / 2018-09-17
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.0.3...v1.1.0)
+
+Enhancements:
+
+* Support Rails 5.x. (Jon Rowe, #33)
+
+### 1.0.3 / 2016-01-28
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.0.2...v1.0.3)
+
+Bug fixes:
+
+* Fix stubbing / mocking models without a primary key. (Andrew Blignaut, #13)
+
+### 1.0.2 / 2015-09-09
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.0.1...v1.0.2)
+
+Bug fixes:
+
+* Fix mocking `belongs_to` associations in Rails 4.2+. (JonRowe, #19)
+* Removed deprecated option from `rspec-activemodel-mocks.gemspec`. (@taki, #14)
+
+### 1.0.1 / 2014-06-02
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/v1.0.0...v1.0.1)
+
+Bug fixes:
+
+* Support RSpec 2.99. (Thomas Holmes)
+
+### 1.0.0 / 2014-06-02
+[Full Changelog](https://github.com/rspec/rspec-activemodel-mocks/compare/extract-from-rspec-rails...v1.0.0)
+
+First release of the extracted `rspec-activemodel-mocks` from `rspec-rails`. (Thomas Holmes)