fix indentation

readme.md

@@ -54,7 +54,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [React Native](https://github.com/jondot/awesome-react-native)
 - [Xamarin](https://github.com/benoitjadinon/awesome-xamarin)
 - [Linux](https://github.com/aleksandar-todorovic/awesome-linux)
-    - [Containers](https://github.com/Friz-zy/awesome-linux-containers)
+	- [Containers](https://github.com/Friz-zy/awesome-linux-containers)
 - [OS X](https://github.com/iCHAIT/awesome-osx)
 	- [Command-Line](https://github.com/herrbischoff/awesome-osx-command-line)
 	- [Screensavers](https://github.com/aharris88/awesome-osx-screensavers)
@@ -174,7 +174,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [CakePHP](https://github.com/friendsofcake/awesome-cakephp)
 - [Symfony](https://github.com/sitepoint/awesome-symfony)
 - [Laravel](https://github.com/chiraggude/awesome-laravel)
-    - [Education](https://github.com/fukuball/Awesome-Laravel-Education/blob/master/langs/en_US.md)
+	- [Education](https://github.com/fukuball/Awesome-Laravel-Education/blob/master/langs/en_US.md)
 - [Rails](https://github.com/ekremkaraca/awesome-rails)
 	- [Gems](https://github.com/hothero/awesome-rails-gem)
 - [Phalcon](https://github.com/sergeyklay/awesome-phalcon)
@@ -261,8 +261,8 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [Command-Line Apps](https://github.com/aharris88/awesome-cli-apps)
 - [ZSH Plugins](https://github.com/unixorn/awesome-zsh-plugins)
 - [GitHub](https://github.com/phillipadsmith/awesome-github)
-    - [Browser Extensions](https://github.com/stefanbuck/awesome-browser-extensions-for-github)
-    - [Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet)
+	- [Browser Extensions](https://github.com/stefanbuck/awesome-browser-extensions-for-github)
+	- [Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet)
 - [Git Cheat Sheet](https://github.com/arslanbilal/git-cheat-sheet)
 - [Git Tips](https://github.com/git-tips/tips)
 - [Git Add-ons](https://github.com/stevemao/awesome-git-addons)
@@ -330,7 +330,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [JSON](https://github.com/burningtree/awesome-json)
 - [Discounts for Student Developers](https://github.com/najela/discount-for-student-dev)
 - [Slack](https://github.com/matiassingers/awesome-slack)
-    - [Communities](https://github.com/filipelinhares/awesome-slack)
+	- [Communities](https://github.com/filipelinhares/awesome-slack)
 - [Conferences](https://github.com/RichardLitt/awesome-conferences)
 - [GeoJSON](https://github.com/tmcw/awesome-geojson)
 - [Sysadmin](https://github.com/n1trux/awesome-sysadmin)