Add badges of downloads and license

Minggang Wang · Minggang Wang · commit 6c2488884f17 · 2017-11-14T10:14:12.000+08:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# rclnodejs - ROS Client Library for JavaScript language[![Coverage Status](https://coveralls.io/repos/github/RobotWebTools/rclnodejs/badge.svg)](https://coveralls.io/github/RobotWebTools/rclnodejs)
+# rclnodejs - ROS Client Library for JavaScript language[![Coverage Status](https://coveralls.io/repos/github/RobotWebTools/rclnodejs/badge.svg)](https://coveralls.io/github/RobotWebTools/rclnodejs)[![npm](https://img.shields.io/npm/dt/rclnodejs.svg)](https://www.npmjs.com/package/rclnodejs)[![Hex.pm](https://img.shields.io/hexpm/l/plug.svg)](https://github.com/RobotWebTools/rclnodejs/blob/develop/LICENSE)
 
 Branch | Linux Build | macOS Build | Windows Build |
 ------------ |  :-------------: | :-------------: | :-------------: |

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# rclnodejs - ROS Client Library for JavaScript language[![Coverage Status](https://coveralls.io/repos/github/RobotWebTools/rclnodejs/badge.svg)](https://coveralls.io/github/RobotWebTools/rclnodejs)`
	`1`	`+# rclnodejs - ROS Client Library for JavaScript language[![Coverage Status](https://coveralls.io/repos/github/RobotWebTools/rclnodejs/badge.svg)](https://coveralls.io/github/RobotWebTools/rclnodejs)[![npm](https://img.shields.io/npm/dt/rclnodejs.svg)](https://www.npmjs.com/package/rclnodejs)[![Hex.pm](https://img.shields.io/hexpm/l/plug.svg)](https://github.com/RobotWebTools/rclnodejs/blob/develop/LICENSE)`
`2`	`2`
`3`	`3`	`Branch \| Linux Build \| macOS Build \| Windows Build \|`
`4`	`4`	`------------ \| :-------------: \| :-------------: \| :-------------: \|`