updated release workflow and whats new

Author: kthyng

.github/workflows/release.yaml

@@ -18,7 +18,7 @@ jobs:
 
       - name: Publish to PyPI
         if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-        uses: pypa/gh-action-pypi-publish@master
+        uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: ${{ secrets.PYPI_USERNAME }}
           password: ${{ secrets.PYPI_PASSWORD }}

docs/whats_new.md

@@ -1,8 +1,14 @@
 # What's New
 
-## v2.1.0 (unreleased)
+## v3.0.0 (March 20, 2023)
 
 * Fixed a deprecation warning (https://github.com/matplotlib/cmocean/pull/86), by @neutrinoceros
 * Added CodeQL workflow (https://github.com/matplotlib/cmocean/pull/85), by bot
 * Changed master to main, by @kthyng
-* Added new CI workflows (testing, dependabot) and added codecov (https://github.com/matplotlib/cmocean/pull/88), by @kthyng
+* Added new CI workflows (testing, dependabot) and added codecov (https://github.com/matplotlib/cmocean/pull/88), by @kthyng
+* Updated URL for STOQS visualization example by @MBARIMike in #75
+* Update README: add cmocean usage in Julia by @ali-ramadhan in #77
+* [MOD] removal of 'figures' for savefig() commands by @jehyunlee in #80
+* Document dependencies by @adamjstewart in #78
+* add r package cmocean by @japhir in #81
+* ENH: work around pending deprecation warnings in MPL by @neutrinoceros in #86