Bar graph added.

node_modules/vega-view-transforms/index.js

@@ -0,0 +1,6 @@
+export {default as bound} from './src/Bound';
+export {default as identifier} from './src/Identifier';
+export {default as mark} from './src/Mark';
+export {default as overlap} from './src/Overlap';
+export {default as render} from './src/Render';
+export {default as viewlayout} from './src/ViewLayout';