message: Mention PR list approval count in readme
diff: @@ -129,6 +129,7 @@ GitHub Enterprise is also supported by [authorizing your own domain in the optio
  - [Differentiates merge commits from regular commits](https://cloud.githubusercontent.com/assets/170270/14101222/2fe2c24a-f5bd-11e5-8b1f-4e589917d4c4.png)
  - [Adds labels to comments by the original poster](https://cloud.githubusercontent.com/assets/4331946/25075520/d62fbbd0-2316-11e7-921f-ab736dc3522e.png)
  - [Adds build status and link to CI by the repo's title](https://user-images.githubusercontent.com/1402241/32562120-d65166e4-c4e8-11e7-90fb-cbaf36e2709f.png)
  +- [Color-codes and counts reviews in PRs list](https://user-images.githubusercontent.com/1402241/33474535-a814ee78-d6ad-11e7-8f08-a8b72799e376.png)
  ### Declutter
  