release notes

Author: Christopher Doris

docs/src/releasenotes.md

@@ -1,5 +1,10 @@
 # Release Notes
 
+## Unreleased
+* `PyArray` can be constructed using the `__array_struct__` part of the Numpy array
+  interface. Constructing `PyArray(x)` is now about 50x faster, or 175x faster if you fully
+  specify the type.
+
 ## 0.9.0 (2022-05-27)
 * **Breaking.** Removes `getpy`: you may now overload `Py` directly, which now need not
   always return a new object (e.g. for singletons or wrappers).