fix: RangePicker should close when clear clicked (#127)

Author: zombieJ

src/RangePicker.tsx

@@ -979,6 +979,7 @@ function InnerRangePicker<DateType>(props: RangePickerProps<DateType>) {
           }
 
           triggerChange(values, null);
+          triggerOpen(false, mergedActivePickerIndex);
         }}
         className={`${prefixCls}-clear`}
       >

tests/range.spec.tsx

@@ -301,7 +301,9 @@ describe('Picker.Range', () => {
         />,
       );
 
+      wrapper.openPicker();
       wrapper.clearValue();
+      expect(wrapper.isOpen()).toBeFalsy();
       expect(onChange.mock.calls[0][1]).toEqual(['', '2000-11-11']);
     });