Update README.md (#68)

README.md

@@ -50,11 +50,7 @@ I want this Sinatra boilerplate app to:
 * run on heroku (don't forget: `$ heroku config:add APP_ENV=production`)
 
 ## <a name="start"></a>Get started
-You need **Ruby (>= 2.7)** and **Bundler** (of course).
-
-Have you heard of __frozen_string_literal__? No? [Read this](https://www.pluralsight.com/blog/software-development/ruby-2-3--working-with-immutable-strings-)
-
-_If you do not have a local PostgresQL DB running, heroku can handle the code as is - do not forget to add **Heroku PostgresQL** addon in your dashboard._
+You need **Ruby (>= 3.2)** and **Bundler** (of course).
 
 * `$ git clone`
 * `$ bundle install`