0.18.1 release notes (#5340)

* 0.18.1 release notes
pydata · May 19, 2021 · 165d496 · 165d496
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diff --git a/HOW_TO_RELEASE.md b/HOW_TO_RELEASE.md
@@ -25,15 +25,11 @@ upstream        https://github.com/pydata/xarray (push)
      ```
  3. Add a list of contributors with:
     ```sh
-    git log "$(git tag --sort="v:refname" | sed -n 'x;$p').." --format=%aN | sort -u | perl -pe 's/\n/$1, /'
-    ```
-    or by substituting the _previous_ release in {0.X.Y-1}:
-    ```sh
-    git log v{0.X.Y-1}.. --format=%aN | sort -u | perl -pe 's/\n/$1, /'
+    git log "$(git tag --sort="v:refname" | tail -1).." --format=%aN | sort -u | perl -pe 's/\n/$1, /'
     ```
     This will return the number of contributors:
     ```sh
-    git log v{0.X.Y-1}.. --format=%aN | sort -u | wc -l
+    git log $(git tag --sort="v:refname" | tail -1).. --format=%aN | sort -u | wc -l
     ```
  4. Write a release summary: ~50 words describing the high level features. This
     will be used in the release emails, tweets, GitHub release notes, etc.

diff --git a/doc/whats-new.rst b/doc/whats-new.rst
@@ -16,16 +16,27 @@ What's New
 
 .. _whats-new.0.18.1:
 
-v0.18.1 (unreleased)
---------------------
+v0.18.1 (18 May 2021)
+---------------------
+
+This release is intended as a small patch release to be compatible with the new
+2021.5.0 ``dask.distributed`` release. It also includes a new
+``drop_duplicates`` method, some documentation improvements, the beginnings of
+our internal Index refactoring, and some bug fixes.
+
+Thank you to all 16 contributors!
+
+Anderson Banihirwe, Andrew, Benoit Bovy, Brewster Malevich, Giacomo Caria,
+Illviljan, James Bourbeau, Keewis, Maximilian Roos, Ravin Kumar, Stephan Hoyer,
+Thomas Nicholas, Tom Nicholas, Zachary Moon.
 
 New Features
 ~~~~~~~~~~~~
 
 - Implement :py:meth:`DataArray.drop_duplicates`
   to remove duplicate dimension values (:pull:`5239`).
   By `Andrew Huang <https://github.com/ahuang11>`_.
-- allow passing ``combine_attrs`` strategy names to the ``keep_attrs`` parameter of
+- Allow passing ``combine_attrs`` strategy names to the ``keep_attrs`` parameter of
   :py:func:`apply_ufunc` (:pull:`5041`)
   By `Justus Magin <https://github.com/keewis>`_.
 - :py:meth:`Dataset.interp` now allows interpolation with non-numerical datatypes,
@@ -34,14 +45,6 @@ New Features
 - Raise more informative error when decoding time variables with invalid reference dates.
   (:issue:`5199`, :pull:`5288`). By `Giacomo Caria <https://github.com/gcaria>`_.
 
-Breaking changes
-~~~~~~~~~~~~~~~~
-
-
-Deprecations
-~~~~~~~~~~~~
-
-
 Bug fixes
 ~~~~~~~~~