Use spaces instead of tabs

The is more common in python and follows other rules usage.

tests/rules/test_python_compile.py

@@ -4,14 +4,14 @@ from tests.utils import Command
 
 
 @pytest.mark.parametrize('command', [
-	Command(script='python foo'), 
-	Command(script='python bar')])
+    Command(script='python foo'),
+    Command(script='python bar')])
 def test_match(command):
-	assert match(command, None)
+    assert match(command, None)
 
 
 @pytest.mark.parametrize('command, new_command', [
-	(Command('python foo'), 'python foo.py'),
-	(Command('python bar'), 'python bar.py')])
+    (Command('python foo'), 'python foo.py'),
+    (Command('python bar'), 'python bar.py')])
 def test_get_new_command(command, new_command):
-	assert get_new_command(command, None) == new_command
+    assert get_new_command(command, None) == new_command