Update CHANGELOG.md

Author: ajones513

packages/react-scripts/CHANGELOG.md

@@ -1,8 +1,14 @@
 # `backpack-react-scripts` Change Log
 
-## 7.0.6 (Pending)
+## 8.0.0 (Pending)
 
 - Added support for loadable components.
+- Added start-ssr command, to produce Node.js-compatible watched output. Several changes to SSR webpack config to support.
+- Defined `typeof window` for browser and SSR environments, enabling dead code elimination (https://webpack.js.org/plugins/define-plugin/#usage)
+- SSR output always include hash as part of filename
+- Added experimental support for https://github.com/mzgoddard/hard-source-webpack-plugin/, enabled by `USE_HARD_SOURCE_WEBPACK_PLUGIN=true` environment variable
+- `web` and `ssr` subpaths for each build's output
+- Output build 'status files' (`.build-status`, one for web, one for SSR), which can be watched by a Node.js server to know when builds are in progress or completed.
 
 ## 7.0.5 - 2020-01-10