Update pylint on CI.

.travis.yml

@@ -276,7 +276,7 @@ jobs:
     - stage: test
       # We need pylint, since above we're not installing a
       # requirements file.
-      install: pip install pylint
+      install: pip install -U pylint
       script: python -m pylint --limit-inference-results=1 --rcfile=.pylintrc gevent
       env: TRAVIS_PYTHON_VERSION=3.7
       name: lint37

dev-requirements.txt

@@ -6,8 +6,8 @@ restview
 pylint>=1.8.0 ; python_version < "3.4"
 # pylint 2 needs astroid 2; unfortunately, it uses `typed_ast`
 # which has a C extension that doesn't build on PyPy
-pylint >= 2.3.1 ; python_version >= "3.4"  and platform_python_implementation == "CPython"
-astroid >= 2.2.5 ; python_version >= "3.4" and platform_python_implementation == "CPython"
+pylint >= 2.5.0 ; python_version >= "3.4"  and platform_python_implementation == "CPython"
+astroid >= 2.4.0 ; python_version >= "3.4" and platform_python_implementation == "CPython"
 
 # For generating CHANGES.rst
 towncrier

src/gevent/testing/patched_tests_setup.py

@@ -16,6 +16,8 @@
 from .sysinfo import RUNNING_ON_APPVEYOR as APPVEYOR
 from .sysinfo import RUNNING_ON_TRAVIS as TRAVIS
 from .sysinfo import RESOLVER_NOT_SYSTEM as ARES
+from .sysinfo import RESOLVER_ARES
+from .sysinfo import RUNNING_ON_CI
 from .sysinfo import RUN_COVERAGE
 
 
@@ -1254,6 +1256,14 @@ def test(*args, **kwargs):
         'test_socket.RecvmsgIntoTCPTest.testRecvmsgIntoGenerator',
     ]
 
+    if RESOLVER_ARES and PY38 and not RUNNING_ON_CI:
+        disabled_tests += [
+            # When updating to 1.16.0 this was seen locally, but not on CI.
+            # Tuples differ: ('ff02::1de:c0:face:8d', 1234, 0, 0)
+            #             != ('ff02::1de:c0:face:8d', 1234, 0, 1)
+            'test_socket.GeneralModuleTests.test_getaddrinfo_ipv6_scopeid_symbolic',
+        ]
+
 # Now build up the data structure we'll use to actually find disabled tests
 # to avoid a linear scan for every file (it seems the list could get quite large)
 # (First, freeze the source list to make sure it isn't modified anywhere)