Update README with B3 header support.
@@ -46,6 +46,7 @@ https://docs.newrelic.com/docs/agents/go-agent/get-started/go-agent-compatibilit
| [mgutz/logxi](https://github.com/mgutz/logxi) | [_integrations/nrlogxi/v1](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrlogxi/v1) | Send agent log messages to Logxi |
| [uber-go/zap](https://github.com/uber-go/zap) | [_integrations/nrzap](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrzap) | Send agent log messages to Zap |
| [pkg/errors](https://github.com/pkg/errors) | [_integrations/nrpkgerrors](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrpkgerrors) | Wrap pkg/errors errors to improve stack traces and error class information |
+| [openzipkin/b3-propagation](https://github.com/openzipkin/b3-propagation) | [_integrations/nrb3](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrb3) | Add B3 headers to outgoing requests |
| [go-sql-driver/mysql](https://github.com/go-sql-driver/mysql) | [_integrations/nrmysql](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrmysql) | Instrument MySQL driver |
| [lib/pq](https://github.com/lib/pq) | [_integrations/nrpq](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrpq) | Instrument PostgreSQL driver |
| [mattn/go-sqlite3](https://github.com/mattn/go-sqlite3) | [_integrations/nrsqlite3](https://godoc.org/github.com/newrelic/go-agent/_integrations/nrsqlite3) | Instrument SQLite driver |
