Merge pull request #45 from aybabtme/export-package-level-log-funcs

Export package func to a standard logger.

README.md

@@ -81,6 +81,13 @@ func main() {
 }
 ```
 
+#### Package logging
+
+Alike the stdlib logger, logrus exposes functions that you can use to log
+to a default global logger. This is convenient to avoid passing a
+`logrus.Logger` thorough your app's packages; you can simply setup `logrus
+from your main package and use the package function directly accross your app.
+
 #### Fields
 
 Logrus encourages careful, structured logging though logging fields instead of
@@ -94,7 +101,7 @@ log = logrus.New()
 log.WithFields(logrus.Fields{
   "event": event,
   "topic": topic,
-  "key": key
+  "key": key,
 }).Fatal("Failed to send event")
 ```
 
@@ -140,9 +147,9 @@ func (hook *AirbrakeHook) Fire(entry *logrus.Entry) error {
 // `Levels()` returns a slice of `Levels` the hook is fired for.
 func (hook *AirbrakeHook) Levels() []logrus.Level {
   return []logrus.Level{
-    logrus.Error,
-    logrus.Fatal,
-    logrus.Panic,
+    logrus.ErrorLevel,
+    logrus.FatalLevel,
+    logrus.PanicLevel,
   }
 }
 ```