Add 0.17.0 release notes

doc/whats-new.rst

@@ -22,7 +22,7 @@ v0.17.0 (24 Feb 2021)
 
 This release brings a few important performance improvements, a wide range of
 usability upgrades, lots of bug fixes, and some new features. These include
-better ``cftime`` support, better ``unstack`` performance, more efficient memory
+better ``cftime`` support, a new quiver plot, better ``unstack`` performance, more efficient memory
 use in rolling operations, and some python packaging improvements. We also have
 a few documentation improvements (and more planned!).
 
@@ -105,6 +105,9 @@ New Features
 - Most rolling operations use significantly less memory. (:issue:`4325`).
   By `Deepak Cherian <https://github.com/dcherian>`_.
 
+- Add :py:meth:`Dataset.drop_isel` and :py:meth:`DataArray.drop_isel`;
+  (:issue:`4658`, :pull:`4819`).
+  By `Daniel Mesejo <https://github.com/mesejo>`_.
 - Xarray now leverages updates as of cftime version 1.4.1, which enable exact I/O
   roundtripping of ``cftime.datetime`` objects (:pull:`4758`).
   By `Spencer Clark <https://github.com/spencerkclark>`_.
@@ -159,9 +162,6 @@ Bug fixes
 - Raise DeprecationWarning when trying to typecast a tuple containing a :py:class:`DataArray`.
   User now prompted to first call `.data` on it (:issue:`4483`).
   By `Chun Ho Chow <https://github.com/chunhochow>`_.
-- Add :py:meth:`Dataset.drop_isel` and :py:meth:`DataArray.drop_isel`;
-  (:issue:`4658`, :pull:`4819`).
-  By `Daniel Mesejo <https://github.com/mesejo>`_.
 - Ensure that :py:meth:`Dataset.interp` raises ``ValueError`` when interpolating
   outside coordinate range and ``bounds_error=True`` (:issue:`4854`,
   :pull:`4855`).
@@ -189,6 +189,8 @@ Documentation
 - Add concat examples and improve combining documentation (:issue:`4620`, :pull:`4645`).
   By `Ray Bell <https://github.com/raybellwaves>`_ and
   `Justus Magin <https://github.com/keewis>`_.
+- Added docs on vectorized indexing; (:pull:`4711`).
+  By `Eric Keenan <https://github.com/EricKeenan`_.
 
 Deprecations
 ~~~~~~~~~~~~