put release date into changelog

022fd164 · Ralf Jung · 3e923399 · 022fd164
Commit 022fd164 authored Dec 19, 2017 by Ralf Jung
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@ way the logic is used on paper.  We also mention some significant changes in the
 Coq development, but not every API-breaking change is listed.  Changes marked
 `[#]` still need to be ported to the Iris Documentation LaTeX file(s).

-## Iris 3.1.0 (unfinished)
+## Iris 3.1.0 (released 2017-12-19)

 Changes in and extensions of the theory: