log: fix example error

examples/log.v

@@ -2,16 +2,16 @@ import log
 
 fn main() {
 	mut l := log.Log{}
-	l.set_level(log.INFO)
+	l.set_level(.info)
 	// Make a new file called info.log in the current folder
 	l.set_full_logpath('./info.log')
 	println('Please check the file: ${l.output_file_name} after this example crashes.')
-  
+
 	l.info('info')
 	l.warn('warn')
 	l.error('error')
 	l.debug('no debug')
-	l.set_level(log.DEBUG)
+	l.set_level(.debug)
 	l.debug('debug')
 	l.fatal('fatal')
 }