message: Fix country_map visualization URL
  When moving the visualizations/ folder to src/ I missed this reference.
diff: @@ -132,7 +132,7 @@ function countryMapChart(slice, payload) {
  .attr('x', 20)
  .attr('y', 60);
  - const url = `/static/assets/visualizations/countries/${fd.select_country.toLowerCase()}.geojson`;
  + const url = `/static/assets/src/visualizations/countries/${fd.select_country.toLowerCase()}.geojson`;
  d3.json(url, function (error, mapData) {
  const features = mapData.features;
  const center = d3.geo.centroid(mapData);
  