Fix tests, skip more Python 2

test/completion/dynamic_arrays.py

@@ -388,6 +388,7 @@ k = 'a'
 #? int()
 some_dct[k]
 
+# python > 3.5
 some_other_dct = dict(some_dct, c=set)
 #? int()
 some_other_dct['a']

test/test_api/test_completion.py

@@ -326,6 +326,7 @@ _dict_keys_completion_tests = [
 ]
 
 
+@pytest.mark.skipif(sys.version_info[0] == 2, reason="Ignore Python 2, because EOL")
 @pytest.mark.parametrize(
     'added_code, column, expected', _dict_keys_completion_tests
 )