release: 4.3.0 (update npm version)

package-lock.json

 {
   "name": "echarts",
-  "version": "4.3.0-rc.2",
+  "version": "4.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

 {
   "name": "echarts",
-  "version": "4.3.0-rc.2",
+  "version": "4.3.0",
   "description": "A powerful charting and visualization library for browser",
   "license": "Apache-2.0",
   "keywords": [