Fixed bug #528

Fixed an incorrect JSON config snipped in README which shows the sink option `period` which in fact is named `batchPeriod`.

Fixed #528.

Author: ckadluba

README.md

@@ -602,7 +602,7 @@ Keys and values are not case-sensitive. This is an example of configuring the si
                 "schemaName": "EventLogging",
                 "autoCreateSqlTable": true,
                 "batchPostingLimit": 1000,
-                "period": "0.00:00:30"
+                "batchPeriod": "0.00:00:30"
             },
             "restrictedToMinimumLevel": "Warning",
             "columnOptionsSection": { . . . }