Add a line linked to feature/apollo-pure branch

Author: piglovesyou

README.md

@@ -44,6 +44,8 @@ branches that you can use either as a reference or merge into your project:
   * [feature/react-intl](https://github.com/kriasoft/react-starter-kit/tree/feature/react-intl) ([PR](https://github.com/kriasoft/react-starter-kit/pull/1135))
     — isomorphic Redux and React Intl by [Pavel Lang](https://github.com/langpavel)
     (see [how to integrate React Intl](./docs/recipes/how-to-integrate-react-intl.md)) (based on `feature/apollo`)
+  * [feature/apollo-pure](https://github.com/kriasoft/react-starter-kit/tree/feature/apollo-pure) ([PR](https://github.com/kriasoft/react-starter-kit/pull/1664))
+    — bare Apollo codebase by [piglovesyou](https://github.com/piglovesyou) (based on `master`)
 
 You can see status of most reasonable merge combination as [PRs labeled as `TRACKING`](https://github.com/kriasoft/react-starter-kit/labels/TRACKING)