Fix deprecations

Makefile

@@ -0,0 +1,2 @@
+test:
+	emacs -Q -L . -l dispwatch-test.el --batch -f ert-run-tests-batch-and-exit

dispwatch-test.el

@@ -1,6 +1,7 @@
 ;;; dispwatch-test.el --- Unit tests -*- Lisp-Interaction-Mode; lexical-binding: t -*-
 
 (require 'cl)
+(require 'dispwatch)
 
 (defun count-dispwatch-timers ()
   (count-if (lambda (x)

dispwatch.el

@@ -88,13 +88,12 @@ checked every `dispwatch-interval' seconds and if a change is
 observed, the hook functions in `dispwatch-display-change-hooks'
 with the new display resolution."
 
-  nil	      ;; The initial value.
-  "dispwatch" ;; The indicator for the mode line.
-  nil	      ;; The minor mode bindings.
-  :group 'dispwatch
+  :init-value nil         ;; The initial value.
+  :lighter    "dispwatch" ;; The indicator for the mode line.
+  :group      'dispwatch
   :after-hook (if dispwatch-mode
-		  (dispwatch--enable)
-		  (dispwatch--disable)))
+                  (dispwatch--enable)
+                  (dispwatch--disable)))
 
 (defun dispwatch--enable ()
   "Enable display reconfiguration detection."