Need dnspython on appveyor too.

appveyor.yml

@@ -131,7 +131,7 @@ install:
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
   # Note that psutil won't build under PyPy on Windows.
-  - "%CMD_IN_ENV% pip install -U setuptools wheel cython greenlet cffi"
+  - "%CMD_IN_ENV% pip install -U setuptools wheel cython greenlet cffi dnspython idna"
 
   - ps:
       if ("${env:PYTHON_ID}" -ne "pypy") {

src/greentest/known_failures.py

@@ -157,12 +157,12 @@ if PYPY:
             'test__socket_dns.py',
         ]
 
-        if TRAVIS:
-            FAILING_TESTS += [
-                # This fails to get the correct results, sometimes. I can't reproduce locally
-                'FLAKY test__example_udp_server.py',
-                'FLAKY test__example_udp_client.py',
-            ]
+    if TRAVIS:
+        FAILING_TESTS += [
+            # This fails to get the correct results, sometimes. I can't reproduce locally
+            'FLAKY test__example_udp_server.py',
+            'FLAKY test__example_udp_client.py',
+        ]
 
     if PY3 and TRAVIS:
         FAILING_TESTS += [