Change "to" to an em dash

Mo’ elegant

ui/src/shared/components/CustomTimeRange.js

@@ -48,7 +48,7 @@ class CustomTimeRange extends Component {
       <div className={classNames("custom-time-range", {show: isVisible})} style={{display: 'flex'}}>
         <button className="btn btn-sm btn-info custom-time-range--btn" onClick={onToggle}>
           <span className="icon clock"></span>
-          {`${moment(lower).format('MMM Do HH:mm')} to ${moment(upper).format('MMM Do HH:mm')}`}
+          {`${moment(lower).format('MMM Do HH:mm')} — ${moment(upper).format('MMM Do HH:mm')}`}
           <span className="caret"></span>
         </button>
         <div className="custom-time-container">