Unpin pytest, pacify new flake8

setup.py

@@ -41,7 +41,7 @@ EXTRAS_REQUIRE = {
         "coverage",
         "hypothesis",
         "pympler",
-        "pytest<3.9",
+        "pytest",
         "six",
         "zope.interface",
     ],
@@ -87,7 +87,9 @@ LONG = (
     + "Release Information\n"
     + "===================\n\n"
     + re.search(
-        "(\d+.\d.\d \(.*?\)\n.*?)\n\n\n----\n\n\n", read("CHANGELOG.rst"), re.S
+        r"(\d+.\d.\d \(.*?\)\n.*?)\n\n\n----\n\n\n",
+        read("CHANGELOG.rst"),
+        re.S,
     ).group(1)
     + "\n\n`Full changelog "
     + "<{url}en/stable/changelog.html>`_.\n\n".format(url=URL)

src/attr/validators.py

@@ -136,7 +136,7 @@ class _InValidator(object):
     def __call__(self, inst, attr, value):
         try:
             in_options = value in self.options
-        except TypeError as e:  # e.g. `1 in "abc"`
+        except TypeError:  # e.g. `1 in "abc"`
             in_options = False
 
         if not in_options: