suppress rubocop load errors

Author: JonRowe

Rakefile

@@ -23,8 +23,12 @@ end
 
 task :build => :verify_private_key_present
 
-require 'rubocop/rake_task'
-desc 'Run RuboCop on the lib directory'
-RuboCop::RakeTask.new(:rubocop) do |task|
-  task.patterns = ['lib/**/*.rb']
+begin
+  require 'rubocop/rake_task'
+  desc 'Run RuboCop on the lib directory'
+  RuboCop::RakeTask.new(:rubocop) do |task|
+    task.patterns = ['lib/**/*.rb']
+  end
+rescue LoadError
+  # no rubocop
 end