Add a changes file for Tom Lowenthal's patch for #4063

changes/ticket-4063

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+  o Minor bugfixes (usability):
+    - Downgrade log messages about circuit timeout calibration from
+      "notice" to "info": they don't require or suggest any human
+      intervention. Patch from Tom Lowenthal. Fixes bug 4063;
+      bugfix on 0.2.2.14-alpha. 
+