README: Update instructions for generating a new app

Closes #1221

The [release of Rails 7.2.0][rails_7_2] introduced its [own linting
mechanism][rails-lint].

Unfortunately, this creates a conflict with [our linting
mechanism][suspenders-lint].

This is only relevant when running `rails new` with our [application
template][].

In order to fix this, we simply require the caller pass
`--skip_rubocop`.

A future commit could explore re-introducing the system executable to
account for our required options, but for now, this fixes the issue.

[rails_7_2]: https://guides.rubyonrails.org/v7.2/7_2_release_notes.html
[rails-lint]: https://guides.rubyonrails.org/v7.2/7_2_release_notes.html#add-omakase-rubocop-rules-by-default
[suspenders-lint]: https://github.com/thoughtbot/suspenders/blob/main/FEATURES.md#linting
[application template]: https://github.com/thoughtbot/suspenders/blob/main/lib/install/web.rb

Author: stevepolitodesign

README.md

@@ -33,8 +33,11 @@ application with Suspenders.
 We skip the [default test framework][] in favor of [RSpec][], and [prefer
 PostgreSQL][] as our database.
 
+We skip [RuboCop rules by default][] in favor of our [holistic linting rules][].
+
 ```
 rails new app_name \
+ --skip_rubocop \
  --skip-test \
  -d=postgresql \
  -m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb
@@ -57,6 +60,8 @@ app_name`, or create your own [railsrc][] file with the following configuration:
 [prefer PostgreSQL]: https://github.com/thoughtbot/dotfiles/pull/728
 [dotfiles]: https://github.com/thoughtbot/dotfiles
 [railsrc]: https://github.com/rails/rails/blob/7f7f9df8641e35a076fe26bd097f6a1b22cb4e2d/railties/lib/rails/generators/rails/app/USAGE#L5C1-L7
+[RuboCop rules by default]: https://guides.rubyonrails.org/v7.2/7_2_release_notes.html#add-omakase-rubocop-rules-by-default
+[holistic linting rules]: https://github.com/thoughtbot/suspenders/blob/main/FEATURES.md#linting
 
 ### With Existing Rails Applications
 

lib/install/web.rb

@@ -22,7 +22,7 @@ def apply_template!
 
     fail Rails::Generators::Error, message
   end
-  if options[:database] == "postgresql" && options[:skip_test]
+  if options[:database] == "postgresql" && options[:skip_test] && options[:skip_rubocop]
     after_bundle do
       gem_group :development, :test do
         gem "suspenders"
@@ -42,6 +42,7 @@ def apply_template!
       === Please use the correct options ===
 
       rails new <app_name> \\
+      --skip-rubocop \\
       --skip-test \\
       -d=postgresql \\
       -m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb