Remove references to UDP logrus hook from README (#108)

The logrus hook was removed in #107.

README.md

@@ -28,45 +28,6 @@ func main() {
 }
 ```
 
-### Emit structured logs to Elastic search using udpbeat
-
-**Add trace's document template to your ElasticSearch cluster**
-
-```shell
-curl -XPUT 'http://localhost:9200/_template/trace' -d@udbbeat/template.json
-```
-
-**Start udpbeat UDP logs collector and emitter**
-
-```shell
-go get github.com/gravitational/udpbeat
-udpbeat
-```
-
-**Hook up logger to UDP collector**
-
-In your code, attach a logrus hook to use udpbeat:
-
-```golang
-
-import (
-   "github.com/gravitational/trace"
-   log "github.com/sirupsen/logrus"
-)
-
-func main() {
-   hook, err := trace.NewUDPHook()
-   if err != nil {
-       log.Fatalf(err)
-   }
-   log.SetHook(hook)
-}
-```
-
-Done! You will get structured logs capturing output, log and error message.
-You can edit `udpbeat/template.json` to modify emitted fields to whatever makes sense to your app.
-
-