Update README.md

Indumathi1195R · web-flow · commit bf8455643e6b · 2020-08-19T10:15:49.000+05:30
diff --git a/README.md b/README.md
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-# custom-header-multi-date-range-picker-flutter
-How to customize the header in Flutter multi date range picker (SfDateRangePicker)?
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+**[View document in Syncfusion Flutter Knowledge base](https://www.syncfusion.com/kb/11897/how-to-customize-the-header-in-flutter-multi-date-range-picker-sfdaterangepicker)**
