Click todayButton should trigger onChange, close #1902

components/date-picker/createPicker.jsx

@@ -64,6 +64,12 @@ export default function createPicker(TheCalendar) {
       };
       let calendarHandler = {
         onOk: this.handleChange,
+        // fix https://github.com/ant-design/ant-design/issues/1902
+        onSelect: (value, cause) => {
+          if (cause && cause.source === 'todayButton') {
+            this.handleChange(value);
+          }
+        },
       };
       if (props.showTime) {
         pickerChangeHandler = {};