fix escape

Author: XieBiao

examples/test.php

@@ -5,8 +5,9 @@
 
 $analyze = new AnalyzeRedis('127.0.0.1', 6379, '123456');
 
-//Scan the keys which can be split by '#' '*' '|'
-$analyze->start(['#', '*', '|']);
+//Scan the keys which can be split by '#' ':'
+//special pattern characters need to escape by '\'
+$analyze->start(['#', ':']);
 
 //Find the csv file in default target folder: ./reports
 //CSV file name format: redis-analysis-{host}-{port}-{db}.csv