Update changelog for 0.16 (#720)

* Update changelog for 0.16

* Finish changelog

Author: dstansby

docs/release.rst

@@ -14,15 +14,23 @@ Release notes
 
 .. _unreleased:
 
-Unreleased
-----------
+0.16.0
+------
 
 Enhancements
 ~~~~~~~~~~~~
 
-* Add support for the Linux aarch64 architecture, and bump the minimum
-macOS deployment target for x86_64 to 10.13.
+* Add ``typesize`` argument to ``Blosc`` to allow for buffers that are passed to ``encode``
+  use that information.  zarr v3 currently has its Blosc codec as bytes-to-bytes but does retain
+  the size information so using it here allows for massive compression ratio gains.
+  By :user:`Ilan Gold <ilan-gold>`
+* Add support for the Linux aarch64 architecture,
   By :user:`Agriya Khetarpal <agriyakhetarpal>`, :issue:`288`.
+* Preallocate output buffers and resize directly as needed.
+  By :user:`John Kirkham <jakirkham>`, :issue:`656`
+* ``Checksum32`` is now an abstract base clase, with ``checksum()`` as an abstract method.
+  This helps ensure that any subclasses implement the ``checksum()`` method.
+  :issue:`711`
 
 Removals
 ~~~~~~~~
@@ -41,29 +49,26 @@ has always been experimental and there is no equivalent in the official
 blsoc Python package.
 By :user:`David Stansby <dstansby>`, :issue:`712`
 
+Maintenance
+~~~~~~~~~~~
+* Replace internal ``Buffer`` usage with ``memoryview``\ s.
+  By :user:`John Kirkham <jakirkham>`, :issue:`656`
+* Bump the minimum macOS deployment target for x86_64 to 10.13.
+  By :user:`Agriya Khetarpal <agriyakhetarpal>`, :issue:`288`.
+
+
 0.15.1
 ------
 
 Improvements
 ~~~~~~~~~~~~
 * Raise a custom `UnknownCodecError` when trying to retrieve an unavailable codec.
   By :user:`Cas Wognum <cwognum>`.
-* Add ``typesize`` argument to ``Blosc`` to allow for buffers that are passed to ``encode``
-  use that information.  zarr v3 currently has its Blosc codec as bytes-to-bytes but does retain
-  the size information so using it here allows for massive compression ratio gains.
-  By :user:`Ilan Gold <ilan-gold>`
 
 Fixes
 ~~~~~
 * Remove redundant ``id`` from codec metadata serialization in Zarr3 codecs.
   By :user:`Norman Rzepka <normanrz>`, :issue:`685`
-* Preallocate output buffers and resize directly as needed.
-  By :user:`John Kirkham <jakirkham>`, :issue:`656`
-
-Maintenance
-~~~~~~~~~~~
-* Replace internal ``Buffer`` usage with ``memoryview``\ s.
-  By :user:`John Kirkham <jakirkham>`, :issue:`656`
 
 .. _release_0.15.0: