examples/basic: add debug level

examples/basic/basic.go

diff --git a/examples/basic/basic.go b/examples/basic/basic.go
index a62ba45..a1623ec 100644
--- a/examples/basic/basic.go
+++ b/examples/basic/basic.go
@@ -9,6 +9,7 @@
 func init() {
 	log.Formatter = new(logrus.JSONFormatter)
 	log.Formatter = new(logrus.TextFormatter) // default
+	log.Level = logrus.DebugLevel
 }
 
 func main() {
@@ -25,6 +26,11 @@
 
 	log.WithFields(logrus.Fields{
 		"animal": "walrus",
+		"number": 8,
+	}).Debug("Started observing beach")
+
+	log.WithFields(logrus.Fields{
+		"animal": "walrus",
 		"size":   10,
 	}).Info("A group of walrus emerges from the ocean")
 
@@ -34,6 +40,10 @@
 	}).Warn("The group's number increased tremendously!")
 
 	log.WithFields(logrus.Fields{
+		"temperature": -4,
+	}).Debug("Temperature changes")
+
+	log.WithFields(logrus.Fields{
 		"animal": "orca",
 		"size":   9009,
 	}).Panic("It's over 9000!")