all: Release 0.31.0
# Changes
+## v0.31.0
+
+- bigtable:
+ - Group mutations across multiple requests.
+- bigquery:
+ - Link to bigquery troubleshooting errors page in bigquery.Error comment.
+- cbt:
+ - Fix go generate command.
+ - Document usage of both maxage + maxversions.
+- datastore:
+ - Passing nil keys results in ErrInvalidKey.
+- firestore:
+ - Clarify what Document.DataTo does with untouched struct fields.
+- profile:
+ - Validate service name in agent.
+- pubsub:
+ - Fix deadlock with pstest and ctx.Cancel.
+ - Fix a possible deadlock in pstest.
+- trace:
+ - Update doc URL with new fragment.
+
+Special thanks to @fastest963 for going above and beyond helping us to debug
+hard-to-reproduce Pub/Sub issues.
+
## v0.30.0
- spanner: DML support added. See https://godoc.org/cloud.google.com/go/spanner#hdr-DML_and_Partitioned_DML for more information.
