README.md in rubocop-github-0.17.0 vs README.md in rubocop-github-0.18.0

@@ -2,36 +2,14 @@
 
 This repository provides recommended RuboCop configuration and additional Cops for use on GitHub open source and internal Ruby projects.
 
 ## Usage
 
-Rubocop 0.68 removed performance cops and 0.72 removed Rails cops. However, upgrading `rubocop-github` without modification will almost definitely create very many new offenses. The current version of this gem exposes the "legacy" configuration under `config/default.yml` and `config/rails.yml` which should be used *if and only if* the version of rubocop is locked to `< 0.68` in your project (which it should be unless you `bundle update rubocop`). It also exposes an "edge" configuration under `config/default_edge.yml` and `config/rails_edge.yml` so that the changes can be tested without introducing breaking changes.
-
-### Legacy usage
-
 **Gemfile**
 
 ``` ruby
-gem "rubocop", "< 0.68"
 gem "rubocop-github"
-```
-
-**.rubocop.yml**
-
-``` yaml
-inherit_gem:
-  rubocop-github:
-    - config/default.yml
-    - config/rails.yml
-```
-
-### Edge usage
-
-**Gemfile**
-
-``` ruby
-gem "rubocop-github"
 gem "rubocop-performance", require: false
 gem "rubocop-rails", require: false
 ```
 
 **.rubocop.yml**
@@ -40,9 +18,14 @@
 inherit_gem:
   rubocop-github:
     - config/default_edge.yml
     - config/rails_edge.yml
 ```
+
+### Legacy usage
+
+If you are using a rubocop version < 1.0.0, you can use rubocop-github version
+0.16.2 (see the README from that version for more details).
 
 ## Testing
 
 `bundle install`
 `bundle exec rake test`