Set <RET> in ruby-mode to reindent-then-newline-and-indent

I switched from this very behavior a couple of days ago cause the
reindenting was causing my headaches every now and then. But not having
has been causing me even bigger headaches.

mode-customizations/ruby-mode.el

@@ -33,7 +33,7 @@
             (setq ruby-electric-expand-delimiters-list (quote (124)))
             (setq whitespace-action (quote (auto-cleanup)))
             (define-key ruby-mode-map
-              (kbd "RET") 'newline-and-indent)
+              (kbd "RET") 'reindent-then-newline-and-indent)
             (define-key ruby-mode-map
               (kbd "s-r") 'ruby-compilation-this-buffer)
             (define-key ruby-mode-map