remove format changes added by black

tests/fixtures.py

@@ -2,9 +2,8 @@ import os
 import os.path
 import collections
 
-import viv_utils
-
 import pytest
+import viv_utils
 
 CD = os.path.dirname(__file__)
 

tests/test_rules.py

@@ -1,6 +1,7 @@
 import textwrap
 
 import pytest
+
 import capa.rules
 from capa.features import String
 from capa.features.insn import Number, Offset