Update dependency pylint to v2.2.2 (#2819)

renovate[bot] · takirala · commit 695a741ab57a · 2018-12-18T13:47:02.000-08:00
diff --git a/frozen_requirements.txt b/frozen_requirements.txt
@@ -91,7 +91,7 @@ Pygments==2.2.0
 pygobject==3.26.1
 PyInstaller==3.3
 PyJWT==1.7.1
-pylint==2.1.1
+pylint==2.2.2
 PyNaCl==1.3.0
 pytest==3.8.2
 pytest-timeout==1.3.3
