py-i2phosts-builder: add -d/--debug

Currently it does nothing, but may be used later.

py-i2phosts-builder

@@ -13,6 +13,8 @@ parser.add_argument('-c', '--config', default='/etc/py-i2phosts/builder.conf', d
 		help='config file to use')
 parser.add_argument('-f', '--file',
 		help='write hosts into specified file')
+parser.add_argument('-d', '--debug', action='store_true',
+		help='write debug messages to stdout')
 args = parser.parse_args()
 
 # read config