Fix README.md

Author: Gogs

README.md

@@ -5,7 +5,7 @@ EveryDocs Core is the server-side part of EveryDocs. This project will contain a
 ## Installation
 
 1. Make sure you have Ruby installed. For an installation guide, check here: [Ruby installation guide](https://guides.rubyonrails.org/getting_started.html#installing-rails)
-2. If you haven't installed the Rails Gem, you can run the following command: ``gem install ruby``
+2. If you haven't installed the Rails Gem, you can run the following command: ``gem install rails``
 3. Clone this repository in a location of your own choice: ``git clone https://github.com/jonashellmann/everydocs-core``
 4. Configure your database connection in config/database.yml
 5. Configure the folder where documents are stored in config/settings.yml