Do not require gem in Gemspec

ShockwaveNN · web-flow · commit af36c8896004 · 2020-01-12T13:53:51.000+03:00
Since rubocop and its extension used only in development in command line Fix rubocop#857
diff --git a/README.md b/README.md
@@ -20,7 +20,7 @@ gem install rubocop-rspec
 or if you use bundler put this in your `Gemfile`
 
 ```
-gem 'rubocop-rspec'
+gem 'rubocop-rspec', require: false
 ```
 
 ## Usage
