Rename 'Rails Gem' to 'Rails Gems'

...and move it under Rails

readme.md

@@ -165,7 +165,7 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [Laravel](https://github.com/chiraggude/awesome-laravel)
     - [Education](https://github.com/fukuball/Awesome-Laravel-Education/blob/master/langs/en_US.md)
 - [Rails](https://github.com/ekremkaraca/awesome-rails)
-- [Rails Gem](https://github.com/hothero/awesome-rails-gem)
+	- [Gems](https://github.com/hothero/awesome-rails-gem)
 - [Phalcon](https://github.com/sergeyklay/awesome-phalcon)
 - [Useful `.htaccess` Snippets](https://github.com/phanan/htaccess)
 - [nginx](https://github.com/fcambus/nginx-resources)