Lint fix

app/assets/javascripts/feature_highlight/feature_highlight.js

 import $ from 'jquery';
-import _ from 'underscore';
 import {
   getSelector,
   togglePopover,

app/assets/javascripts/shared/popover.js

@@ -31,4 +31,4 @@ export function mouseenter() {
 
 export function debouncedMouseleave(debounceTimeout = 300) {
   return debounce(mouseleave, debounceTimeout);
-}
\ No newline at end of file
+}