Fixed missing entry file in npm.

Author: tangbc

package.json

@@ -1,10 +1,10 @@
 {
   "name": "vue-virtual-scroll-list",
-  "version": "1.3.5",
+  "version": "1.3.6",
   "description": "A vue component support big amount data list with high scroll performance.",
-  "main": "./src/index.js",
+  "main": "src/index.js",
   "files": [
-    "./src/index.js"
+    "src"
   ],
   "scripts": {
     "test": "rm -rf coverage && jest",