tox: bump pylint version to latest (2.3.1)

The previous version was emitting errors due to an incompatibility with
one of its dependencies.

(We could have pinned the dependency instead, but staying current on
pylint is a worthy goal in and of itself.)

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index d3717200..967321f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,7 +21,7 @@ setenv =
 basepython = python3
 deps =
     # requirements
-    pylint==2.2.2
+    pylint==2.3.1
     # test-requirements because unit tests are now present in cloudinit tree
     -r{toxinidir}/test-requirements.txt
 commands = {envpython} -m pylint {posargs:cloudinit tests tools}