Installation instructions do not work

[gustavjf]

Hi, thanks for this package!

Just thought I'd mention your init.el installation instructions did not work for me. I had to manually enable flycheck-popup-tip-mode in every new buffer.

I am using Emacs 26.1, without x.

I managed to get it to work by using:

(with-eval-after-load 'flycheck
  (flycheck-popup-tip-mode))

instead of

(with-eval-after-load 'flycheck
  '(add-hook 'flycheck-mode-hook 'flycheck-popup-tip-mode))