add default Charts export

- to support: import Charts from 'ant-design-pro/lib/Charts';

src/components/Charts/index.js

@@ -15,7 +15,24 @@ import TimelineChart from './TimelineChart';
 
 const yuan = val => `¥ ${numeral(val).format('0,0')}`;
 
+const Charts = {
+  yuan,
+  Bar,
+  Pie,
+  Gauge,
+  Radar,
+  MiniBar,
+  MiniArea,
+  MiniProgress,
+  ChartCard,
+  Field,
+  WaterWave,
+  TagCloud,
+  TimelineChart,
+};
+
 export {
+  Charts as default,
   yuan,
   Bar,
   Pie,