Fix tests in Python 2

test/completion/precedence.py

@@ -169,6 +169,8 @@ from datetime import datetime, timedelta
 # magic methods
 # -----------------
 
+# python >= 3.5
+
 class C:
     def __sub__(self, other) -> int: ...
     def __radd__(self, other) -> float: ...

test/test_api/test_analysis.py

@@ -4,7 +4,7 @@ import pytest
 
 
 @pytest.mark.skipif(sys.version_info[0] == 2, reason="Ignore Python 2, because EOL")
-def test_issue436(Script):
+def test_issue436(Script, skip_python2):
     code = "bar = 0\nbar += 'foo' + 4"
     errors = set(repr(e) for e in Script(code)._analysis())
     assert len(errors) == 2