doc: tell rake robucup is needed

"rake robucop" is missing comparing of what ran on travis-ci. Adds it, so contributor will not missing syntax issue with old puppet version.
voxpupuli · May 25, 2018 · 09cbe24 · 09cbe24
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commit 09cbe24
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diff --git a/README.md b/README.md
@@ -1934,6 +1934,7 @@ gem install bundler
 bundle install
 bundle exec rake lint
 bundle exec rake validate
+bundle exec rake rubocup
 bundle exec rake spec SPEC_OPTS='--format documentation'
 ```