Tweak the installation doc

This commit synchronizes with the README's installation sesion. https://github.com/rubocop/rubocop-performance/#installation
rubocop · Jan 26, 2022 · 67f025f · 67f025f
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commit 67f025f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/modules/ROOT/pages/installation.adoc b/docs/modules/ROOT/pages/installation.adoc
@@ -11,5 +11,5 @@ or if you use bundler put this in your `Gemfile`
 
 [source,ruby]
 ----
-gem 'rubocop-performance'
+gem 'rubocop-performance', require: false
 ----