```ruby
# travis login --pro
# travis history -l1 -bmaster
module Herkko
  # Checks status of CI build from Travis.
  class Travis
    def status_for(branch)
      if travis_cli_installed?
        status = fetch_status(branch)
        status_to_code(status)
      else
        Herkko.info "Travis CLI has not been installed, run: gem install travis"
        :unknown
      end
    end

    private

    def fetch_status(branch)
      Herkko.run(
        "travis",
        "history",
        "--skip-version-check",
        "-l",
        "1",
        "-b",
        branch
      )
    end

    def travis_cli_installed?
      system("which travis > /dev/null 2>&1")
    end

    def status_to_code(status)
      if !status[1].empty?
        Herkko.info "There was an error with checking Travis: #{status[1]}"
        :red
      elsif status[0].strip.empty?
        :not_used
      else
        case status[0].split(":")[0]
        when /passed/
          :green
        when /started/
          :yellow
        when /created/
          :queued
        else
          :red
        end
      end
    end
  end
end
```

Fix Travis CLI installation check
user
```ruby
# travis login --pro
# travis history -l1 -bmaster
module Herkko
  # Checks status of CI build from Travis.
  class Travis
    def status_for(branch)
      if travis_cli_installed?
        status = fetch_status(branch)
        status_to_code(status)
      else
        Herkko.info "Travis CLI has not been installed, run: gem install travis"
        :unknown
      end
    end

    private

    def fetch_status(branch)
      Herkko.run(
        "travis",
        "history",
        "--skip-version-check",
        "-l",
        "1",
        "-b",
        branch
      )
    end

    def travis_cli_installed?
      system("command -v travis > /dev/null 2>&1")
    end

    def status_to_code(status)
      if !status[1].empty?
        Herkko.info "There was an error with checking Travis: #{status[1]}"
        :red
      elsif status[0].strip.empty?
        :not_used
      else
        case status[0].split(":")[0]
        when /passed/
          :green
        when /started/
          :yellow
        when /created/
          :queued
        else
          :red
        end
      end
    end
  end
end
```
assistant