Update README.md

Indumathi1195R · web-flow · commit d9706e2d5c6e · 2020-05-05T12:21:09.000+05:30
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 # How to switch between the date range picker views in Flutter date range picker (SfDateRangePicker)?
 
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 In the flutter date range picker, you can navigate between the picker views. Switching between picker views has been achieved using the `view` property of DateRangePickerController and tapping the header of the picker views.
 
 ## Step 1:
