Added a changelog

CHANGELOG.md

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+Change Log
+====================================================================================================
+All notable changes will be documented in this file.
+coverage-istanbul-loader adheres to [Semantic Versioning](http://semver.org/).
+
+
+[v3.0.0](https://github.com/JS-DevTools/coverage-istanbul-loader/tree/v3.0.0) (2020-03-05)
+----------------------------------------------------------------------------------------------------
+
+- Moved coverage-istanbul-loader to the [@JSDevTools scope](https://www.npmjs.com/org/jsdevtools) on NPM
+
+- The "coverage-istanbul-loader" NPM package is now just a wrapper around the scoped "@jsdevtools/coverage-istanbul-loader" package
+
+[Full Changelog](https://github.com/JS-DevTools/coverage-istanbul-loader/compare/v2.0.3...v3.0.0)
+
+
+
+[v2.0.0](https://github.com/JS-DevTools/coverage-istanbul-loader/tree/v2.0.0) (2019-08-09)
+----------------------------------------------------------------------------------------------------
+
+- Major dependency updates that _could_ have breaking changes
+
+[Full Changelog](https://github.com/JS-DevTools/coverage-istanbul-loader/compare/v1.0.0...v2.0.0)
+
+
+
+[v1.0.0](https://github.com/JS-DevTools/coverage-istanbul-loader/tree/v1.0.0) (2019-02-02)
+----------------------------------------------------------------------------------------------------
+
+Initial release 🎉