Update changelog

Tadaboody · Tadaboody · commit aaf7f7fcca07 · 2018-12-05T10:41:30.000+02:00
diff --git a/changelog/3191.feature.rst b/changelog/3191.feature.rst
@@ -0,0 +1 @@
+Add warning when asserting ``None`` directly

Original file line number	Diff line number	Diff line change
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	`1`	+Add warning when asserting ``None`` directly