Update change log to reflect v2.3.1 release date

drdavella · drdavella · commit ef11a5bb6422 · 2018-12-20T16:10:47.000-05:00
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -1,4 +1,4 @@
-2.3.1 (unreleased)
+2.3.1 (2018-12-20)
 ------------------
 
 - Ensure that top-level accesses to the tree outside a closed context handler

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-2.3.1 (unreleased)`
	`1`	`+2.3.1 (2018-12-20)`
`2`	`2`	`------------------`
`3`	`3`
`4`	`4`	`- Ensure that top-level accesses to the tree outside a closed context handler`