feat(version):add version get api.

src/index.js

@@ -34,4 +34,5 @@ export { default as Rate } from './rate/';
 export { default as Radio } from './radio/';
 export { default as Notification } from './notification/';
 export { default as Carousel } from './carousel/';
-export { default as Form } from './form/';
+export { default as Form } from './form/';
+export { default as version } from './version';

src/version/index.js

@@ -0,0 +1,2 @@
+import { version } from '../../package.json';
+export default version;