Update readme.md

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

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 - [Slack](https://github.com/matiassingers/awesome-slack#readme) - Team collaboration.
 	- [Communities](https://github.com/filipelinhares/awesome-slack#readme)
-	- [Slack Apps For Developers](https://github.com/axolo-co/awesome-slack-apps-for-developers#readme) - Slack integrations to help developers and tech teams be more productive.
+	- [Slack Apps for Developers](https://github.com/axolo-co/awesome-slack-apps-for-developers#readme) - Slack integrations to help developers and tech teams be more productive.
 - [Remote Jobs](https://github.com/lukasz-madon/awesome-remote-job#readme)
 - [Productivity](https://github.com/jyguyomarch/awesome-productivity#readme)
 - [Niche Job Boards](https://github.com/tramcar/awesome-job-boards#readme)