Atom-Editor: Don't work rubocop with atom

It seems that you're using rvm to manage your environment. What i did to get it to work was follow the instructions on their repo: https://github.com/AtomLinter/linter-rubocop#settings

# make sure I'm in the global gemset
$ rvm gemset use global
# install the gem
$ gem install rubocop

configure atom to use the global. Edit your atom's config file (config.cson) and add

*:
  "linter-rubocop":
    executablePath: "~/.rvm/gems/ruby-2.3.1@global/wrappers"
  "linter-ui-default": {}

Note: make sure that the ruby version is the one you're using.