Update changelog
diff --git a/CHANGELOG.md b/CHANGELOG.md
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@@ -1,6 +1,13 @@
 Releases
 ========
 
+v0.2.0 (unreleased)
+===================
+
+-   Repeatedly appending to the same error is now faster due to fewer
+    allocations.
+
+
 v0.1.0 (2017-31-03)
 ===================