Superset issue #4512: fixing histogram (#4513)

* fixing histogram axes and colors, adding normalized and x-axis label options

* adding y-axis label option

superset/assets/javascripts/explore/stores/controls.jsx

@@ -1985,5 +1985,13 @@ export const controls = {
     description: t('Whether to fill the objects'),
     default: false,
   },
+
+  normalized: {
+    type: 'CheckboxControl',
+    label: t('Normalized'),
+    renderTrigger: true,
+    description: t('Whether to normalize the histogram'),
+    default: false,
+  },
 };
 export default controls;

superset/assets/javascripts/explore/stores/visTypes.js

@@ -1110,6 +1110,8 @@ export const visTypes = {
         controlSetRows: [
           ['color_scheme'],
           ['link_length'],
+          ['x_axis_label', 'y_axis_label'],
+          ['normalized'],
         ],
       },
     ],