chore(main): release 0.21.0

Author: release-please[bot]

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/bigframes/#history
 
+## [0.21.0](https://github.com/googleapis/python-bigquery-dataframes/compare/v0.20.1...v0.21.0) (2024-02-07)
+
+
+### Features
+
+* Add `Series.cov` method ([#368](https://github.com/googleapis/python-bigquery-dataframes/issues/368)) ([443db22](https://github.com/googleapis/python-bigquery-dataframes/commit/443db228375da9b232376140c9d5b0db14895eae))
+
 ## [0.20.1](https://github.com/googleapis/python-bigquery-dataframes/compare/v0.20.0...v0.20.1) (2024-02-06)
 
 

bigframes/version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.20.1"
+__version__ = "0.21.0"