linter-rubocop 0.5.0 Error: /Users/uraway/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems.rb:270:in `find_spec_for_exe': can't find gem rubocop (>= 0.a) (Gem::GemNotFoundException) from /Users/uraway/.rvm/rubies/ruby-2.3.1/lib/rub…