update changelog for next release (#1710)

firebase · Aug 17, 2018 · ea4c8c7 · ea4c8c7
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diff --git a/Firebase/Messaging/CHANGELOG.md b/Firebase/Messaging/CHANGELOG.md
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+# 2018-08-28 -- v3.1.1
+- Ensure NSUserDefaults is persisted properly before app close. (#1646)
+- Internal code cleanup. (#1666)
+
 # 2018-07-31 -- v3.1.0
 - Added support for global Firebase data collection flag. (#1219)
 - Fixed an issue where Messaging wouldn't properly unswizzle swizzled delegate