releasenotes.txt: Preliminary note on unwrap of TargetInvocationException.

Author: oskarb

releasenotes.txt

@@ -1,3 +1,11 @@
+Tentative for 4.1:
+
+  Possible breaking change: Proxies for classes that used lazy fields (not collections)
+  would have any exceptions from the entity wrapped in TargetInvocationException. This
+  wrapping exception have now been removed. Where relevant, you should instead catch
+  the original exception type you throw.
+
+
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