Change to color-identifiers-mode for simpler coloring

elisp/modes/default-modes.el

@@ -2,11 +2,11 @@
 
 ;;; Code:
 ;; Easier to identify identifiers
-;; The init add-hook seems to be the only way this works.
+(use-package color-identifiers-mode
-;; :hook does not work with rainbow identifiers for some reason.
-(use-package rainbow-identifiers
   :ensure t
-  :init (add-hook 'prog-mode-hook 'rainbow-identifiers-mode))
+  :init (add-hook 'after-init-hook 'global-color-identifiers-mode)
+  :config
+  (setq color-identifiers:recoloring-delay 1))
 
 ;; Flycheck is enabled globally.
 (use-package flycheck