[devdocsgjs/main: 1783/1867] Update ruby version specified in readme

[Andy Holmes <andyholmes src gnome org>]

commit bbc00deaf9cb488d2fc495f32bc3b6c84a6b0ec9
Author: Jordan Tepper <jstepper91 gmail com>
Date:   Sun Oct 10 13:23:06 2021 -0400

    Update ruby version specified in readme
    
    Following quick start will lead you to download v2.6 which rvm will then complain about

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 5fba337f..e67b01f3 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Unless you wish to contribute to the project, we recommend using the hosted vers
 
 DevDocs is made of two pieces: a Ruby scraper that generates the documentation and metadata, and a 
JavaScript app powered by a small Sinatra app.
 
-DevDocs requires Ruby 2.6.x, libcurl, and a JavaScript runtime supported by 
[ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; 
[Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
+DevDocs requires Ruby 2.7.4, libcurl, and a JavaScript runtime supported by 
[ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; 
[Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
 
 ```sh
 git clone https://github.com/freeCodeCamp/devdocs.git && cd devdocs