Update version specifier to be more specific.

Author: lucaswiman

tests/issue_85_module.py

@@ -3,6 +3,5 @@ def forwardref_method(foo: "ForwardRef", bar: str) -> "ForwardRef":
 
 
 class ForwardRef:
-    x: str
     def __init__(self, x="default"):
         self.x = x

tests/test_issues.py

@@ -255,7 +255,7 @@ def test_issue_77_async_generator_partial():
 
 
 
-@pytest.mark.skipif(sys.version_info < (3, 3), reason="Tests PEP 367 behavior, which was introduced in python 3.3.")
+@pytest.mark.skipif(sys.version_info < (3, 7, 6), reason="The __wrapped__ behavior in get_type_hints being tested was not added until python 3.7.6.")
 def test_issue_85_wrapped_forwardref_annotation():
     import typing
     from . import issue_85_module