Make eaf-file-open-in-dired and eaf-open-url obsolete

eaf.el

@@ -7,7 +7,7 @@
 ;; Copyright (C) 2018, Andy Stewart, all rights reserved.
 ;; Created: 2018-06-15 14:10:12
 ;; Version: 0.5
-;; Last-Updated: Tue Dec 24 13:06:24 2019 (-0500)
+;; Last-Updated: Tue Dec 24 22:37:13 2019 (-0500)
 ;;           By: Mingde (Matthew) Zeng
 ;; URL: http://www.emacswiki.org/emacs/download/eaf.el
 ;; Keywords:
@@ -928,7 +928,7 @@ of `eaf--buffer-app-name' inside the EAF buffer."
     (message "[EAF/browser] %s is an invalid URL." url)))
 
 ;;;###autoload
-(defalias 'eaf-open-url #'eaf-open-browser)
+(define-obsolete-function-alias 'eaf-open-url #'eaf-open-browser)
 
 ;;;###autoload
 (defun eaf-open-demo ()
@@ -967,7 +967,7 @@ Other files will open normally with `dired-find-file' or `dired-find-alternate-f
           (t (dired-find-file)))))
 
 ;;;###autoload
-(defalias 'eaf-file-open-in-dired #'eaf-open-this-from-dired)
+(define-obsolete-function-alias 'eaf-file-open-in-dired #'eaf-open-this-from-dired)
 
 ;;;###autoload
 (defun eaf-open (url &optional app-name arguments)