Muhammad Helmi

Results 2 issues of Muhammad Helmi

![image](https://user-images.githubusercontent.com/11200106/79609704-80899880-80f7-11ea-9b72-70d794835ca6.png)

Date range picker is supported by [MeterialDatePicker](https://material.io/components/date-pickers), I think it's an important feature, and many people looking for it.