make sure py2 throws a deprecation notice

haruhi_dl/__init__.py

@@ -1,7 +1,10 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # coding: utf-8
 
-from __future__ import unicode_literals
+import sys
+
+if sys.version_info[0] == 2:
+    sys.exit('haruhi-dl no longer works on Python 2, use Python 3 instead')
 
 __license__ = 'LGPL-3.0-or-later'
 
@@ -9,7 +12,6 @@ import codecs
 import io
 import os
 import random
-import sys
 
 
 from .options import (

haruhi_dl/__main__.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import unicode_literals
 
 # Execute with
@@ -7,6 +7,9 @@ from __future__ import unicode_literals
 
 import sys
 
+if sys.version_info[0] == 2:
+    sys.exit('haruhi-dl no longer works on Python 2, use Python 3 instead')
+
 if __package__ is None and not hasattr(sys, 'frozen'):
     # direct call of __main__.py
     import os.path