Add a way to specify multiple extensions to README.md

Follow up rubocop/rubocop#7104 and rubocop/rubocop-jp#53 (JA) . This PR adds a way to specify multiple extensions to README.md.
rubocop · Jun 4, 2019 · bd54721 · bd54721
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commit bd54721
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diff --git a/README.md b/README.md
@@ -34,6 +34,14 @@ Put this into your `.rubocop.yml`.
 require: rubocop-rails
 ```
 
+Alternatively, use the following array notation when specifying multiple extensions.
+
+```yaml
+require:
+  - rubocop-other-extension
+  - rubocop-rails
+```
+
 Now you can run `rubocop` and it will automatically load the RuboCop Rails
 cops together with the standard cops.