def mine
    page = @client.get_nokogiri '/atstellar'
    class_links = page.css('a[href*="/S/course/"]').
        map { |link| Stellar::Course.from_link link, @client }.reject(&:nil?)
  end
def mine
    page = @client.get_nokogiri '/atstellar'
    class_links = page.css('a[href*="/S/course/"]').
        map { |link| Stellar::Course.from_link link, @client }.reject(&:nil?)
  end
My classes.
 @return [Array] array with one Hash per class; Hashes have :number and
                 :url keys