Add release note in v0.16.1

Author: invisibleroads

doc/source/whatsnew/v0.16.1.txt

@@ -59,7 +59,6 @@ Performance Improvements
 
 Bug Fixes
 ~~~~~~~~~
-
 - Fixed bug (:issue:`9542`) where labels did not appear properly in legend of ``DataFrame.plot()``. Passing ``label=`` args also now works, and series indices are no longer mutated.
 
 
@@ -78,3 +77,5 @@ Bug Fixes
 
 
 - Bug in ``Series.quantile`` on empty Series of type ``Datetime`` or ``Timedelta`` (:issue:`9675`)
+
+- Bug in ``to_msgpack`` and ``read_msgpack`` zlib and blosc compression support (:issue:`9783`)