feat：0.0.3修改说明文档

package.json

 {
     "name": "istanbul-middleware-ry",
     "description": "Connect middleware for Istanbul to handle server-side as well as browser coverage use-cases for node apps",
-    "version": "0.0.2",
+    "version": "0.0.3",
     "main": "lib/index.js",
     "files": [
         "lib"