Update CHANGELOG [INCOMPLETE]

- Creted `CHANGELOG.md`.
- Writing changelog for `v2.0.0`.

Author: iamWing

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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## 2.0.0 - 2018-02-01
+### Added
+- ESLint for code checking on Javascript files.
+- Airbnb's extensible `.eslintrc` package & its' peer dependencies. 
+- `.eslintrc` that extends Airbnb's config and has customised rules configured.
+- ESLint plugin `eslint-import-resolver-webpack` for ESLint to resolve path
+aliases set in Webpack config.
+- Webpack plugin `copy-pkg-json-webpack-plugin` to generate a `package.json` 
+file and pack into Webpack's bundled package for production.
+
+### Changed
+- Refactored Webpack config file to have `mainConfig` & `rendererConfig` 
+cleaned up, and set mode by environment variable.
+
+### Removed
+- Redux & React-Redux related settings, including packages listed on 
+`devDependencies`, path aliases & folders listed in folder structure.
+  - Since Electron's built-in IPC & basic React states should be enough to get 
+    the works done, and most Electron apps which have their application logic 
+    runs on Electron's `main` process rather then `renderer` process actually 
+    don't need React-Redux, `redux` & `react-redux` are no longer included in 
+    this boilerplate.
+- Separated Webpack config files for `development` & `production` mode.
+
+[Unreleased]: https://github.com/Devtography/electron-react-typescript-webpack-boilerplate/compare/v2.0.0...HEAD