chore: release 2.8.0 (#510)

🤖 I have created a release \*beep\* \*boop\* 
---
## [2.8.0](https://www.github.com/googleapis/python-bigquery/compare/v2.7.0...v2.8.0) (2021-02-08)


### Features

* add mtls support to client ([#492](https://www.github.com/googleapis/python-bigquery/issues/492)) ([1823cad](https://www.github.com/googleapis/python-bigquery/commit/1823cadee3acf95c516d0479400e4175349ea199))


### Bug Fixes

* don't try to close closed cursors ([#498](https://www.github.com/googleapis/python-bigquery/issues/498)) ([bf44e7b](https://www.github.com/googleapis/python-bigquery/commit/bf44e7b67d2de41c13053a4550484b9ea049db3e))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

CHANGELOG.md

@@ -4,6 +4,18 @@
 
 [1]: https://pypi.org/project/google-cloud-bigquery/#history
 
+## [2.8.0](https://www.github.com/googleapis/python-bigquery/compare/v2.7.0...v2.8.0) (2021-02-08)
+
+
+### Features
+
+* Add mTLS support to client. ([#492](https://www.github.com/googleapis/python-bigquery/issues/492)) ([1823cad](https://www.github.com/googleapis/python-bigquery/commit/1823cadee3acf95c516d0479400e4175349ea199))
+
+
+### Bug Fixes
+
+* Don't try to close closed cursors. ([#498](https://www.github.com/googleapis/python-bigquery/issues/498)) ([bf44e7b](https://www.github.com/googleapis/python-bigquery/commit/bf44e7b67d2de41c13053a4550484b9ea049db3e))
+
 ## [2.7.0](https://www.github.com/googleapis/python-bigquery/compare/v2.6.2...v2.7.0) (2021-01-27)
 
 

google/cloud/bigquery/version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2.7.0"
+__version__ = "2.8.0"