fix: switched from biplist to plistlib (following dmgbuild's example)

Author: ErikBjare

scripts/package/dmgbuild-settings.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-import biplist
+import plistlib
 import os.path
 
 # Use like this: dmgbuild -s settings.py "Test Volume" test.dmg
@@ -18,7 +18,8 @@
 
 def icon_from_app(app_path):
     plist_path = os.path.join(app_path, 'Contents', 'Info.plist')
-    plist = biplist.readPlist(plist_path)
+    with open(plist_path, "rb") as f:
+        plist = plistlib.load(f)
     icon_name = plist['CFBundleIconFile']
     icon_root,icon_ext = os.path.splitext(icon_name)
     if not icon_ext: