release 2.0.0

package.json

 {
     "name": "echarts",
     "description": "Enterprise Charts，基于Canvas，纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据可视化表。",
-    "version": "1.4.1",
+    "version": "2.0.0",
     "maintainers": [
         { "name": "Kener", "email": "linzhifeng@baidu.com" },
         { "name": "Pissang", "email": "shenyi01@baidu.com" },
+        { "name": "Erik", "email": "dongrui02@baidu.com" },
         { "name": "Yangji", "email": "yangji01@baidu.com" }
     ],
     "dependencies": {
-        "zrender": "~1.1.2"
+        "zrender": "~2.0.0"
     },
     "repository": "git://github.com/ecomfe/echarts",
     "main": "echarts",