Update package.json main file

package.json

@@ -2,7 +2,7 @@
   "name": "weui-wxss",
   "version": "1.1.1",
   "description": "weui-wxss",
-  "main": "dist/app.wxss",
+  "main": "dist/style/weui.wxss",
   "directories": {
     "example": "example"
   },
@@ -14,7 +14,10 @@
     "type": "git",
     "url": "https://github.com/weui/weui-wxss/"
   },
-  "keywords": ["weui", "wxss"],
+  "keywords": [
+    "weui",
+    "wxss"
+  ],
   "author": "wechat ui team",
   "license": "MIT",
   "devDependencies": {
@@ -24,4 +27,4 @@
     "gulp-postcss": "^6.2.0",
     "gulp-rename": "^1.2.2"
   }
-}
+}
\ No newline at end of file