add blank line a end of file

assets/src/scripts/monitoring-location/components/hydrograph/graph-controls.js

@@ -80,4 +80,4 @@ export const drawGraphControls = function(elem, store) {
         .attr('id', 'median-label')
         .attr('for', 'median-checkbox')
         .text('Display median');
-};
\ No newline at end of file
+};