Remove outdated version of Airbrake hook
It seems unnecessary to duplicate the code (which is now outdated) in
the README. Instead, link to the built-in hooks where a user can see
the code.
diff --git a/README.md b/README.md
index 607eab1..178123d 100644
--- a/README.md
+++ b/README.md
@@ -164,43 +164,8 @@
tracking service on `Error`, `Fatal` and `Panic`, info to StatsD or log to
multiple places simultaneously, e.g. syslog.
-```go
-// Not the real implementation of the Airbrake hook. Just a simple sample.
-import (
- log "github.com/Sirupsen/logrus"
-)
-
-func init() {
- log.AddHook(new(AirbrakeHook))
-}
-
-type AirbrakeHook struct{}
-
-// `Fire()` takes the entry that the hook is fired for. `entry.Data[]` contains
-// the fields for the entry. See the Fields section of the README.
-func (hook *AirbrakeHook) Fire(entry *logrus.Entry) error {
- err := airbrake.Notify(entry.Data["error"].(error))
- if err != nil {
- log.WithFields(log.Fields{
- "source": "airbrake",
- "endpoint": airbrake.Endpoint,
- }).Info("Failed to send error to Airbrake")
- }
-
- return nil
-}
-
-// `Levels()` returns a slice of `Levels` the hook is fired for.
-func (hook *AirbrakeHook) Levels() []log.Level {
- return []log.Level{
- log.ErrorLevel,
- log.FatalLevel,
- log.PanicLevel,
- }
-}
-```
-
-Logrus comes with built-in hooks. Add those, or your custom hook, in `init`:
+Logrus comes with [built-in hooks](hooks/). Add those, or your custom hook, in
+`init`:
```go
import (
