Enable subword-mode for yaml-mode

modules/prelude-yaml.el

@@ -36,6 +36,7 @@
 ;; yaml-mode doesn't derive from prog-mode, but we can at least enable
 ;; whitespace-mode and apply cleanup.
 (add-hook 'yaml-mode-hook 'whitespace-mode)
+(add-hook 'yaml-mode-hook 'subword-mode)
 (add-hook 'yaml-mode-hook
           (lambda () (add-hook 'before-save-hook 'prelude-cleanup-maybe nil t)))