Use dataset interface instead of getAttribute

Author: wojtekmaj

src/TimeInput.jsx

@@ -32,7 +32,7 @@ function hoursAreDifferent(date1, date2) {
 }
 
 function isInternalInput(element) {
-  return element.getAttribute('data-input') === 'true';
+  return element.dataset.input === 'true';
 }
 
 function findInput(element, property) {

src/TimePicker.jsx

@@ -96,7 +96,7 @@ export default class TimePicker extends PureComponent {
     }
 
     if (openClockOnFocus) {
-      if (event.target.getAttribute('data-select') === 'true') {
+      if (event.target.dataset.select === 'true') {
         return;
       }