Remove example references

examples/logger/main.go

@@ -28,8 +28,6 @@ func (l errorLogger) Infof(format string, v ...interface{}) {
 func (l errorLogger) Debugf(format string, v ...interface{}) {
 }
 
-func (l errorLogger) Tracef(format string, v ...interface{}) {}
-
 func main() {
 	mylogger := &errorLogger{}
 

logger.go

@@ -39,6 +39,3 @@ func (l stdDebugLogger) Infof(format string, v ...interface{}) {
 func (l stdDebugLogger) Debugf(format string, v ...interface{}) {
 	log.Printf(fmt.Sprintf("%s DEBUG: %s", loggingPrefix, format), v...)
 }
-
-// Tracef -
-func (l stdDebugLogger) Tracef(format string, v ...interface{}) {}