fixed typo in example config (#70)

see also http://codeception.com/docs/11-Codecoverage

tests/codeception.yml

@@ -4,7 +4,7 @@ actor: Tester
 #    enabled: true
 #    #remote: true
 #    #remote_config: '../tests/codeception.yml'
-#    white_list:
+#    whitelist:
 #        include:
 #            - ../models/*
 #            - ../controllers/*
@@ -33,4 +33,4 @@ settings:
 config:
     # the entry script URL (with host info) for functional and acceptance tests
     # PLEASE ADJUST IT TO THE ACTUAL ENTRY SCRIPT URL
-    test_entry_url: http://localhost:8080/index-test.php
+    test_entry_url: http://localhost:8080/index-test.php