compress: index.js && update: README.md

Author: YasinChan

README.md

@@ -145,7 +145,7 @@ $ npm i vue-simple-lazyload -S
    ```
 
 ## Required
-> This project base on [Intersection_Observer_API](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API). Need import polyfill.
+> This project base on [Intersection_Observer_API](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API). Need import polyfill if necessary.
    
 
 ## TODO

index.js

@@ -18,6 +18,7 @@
     "rollup": "^2.0.3",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-uglify": "^6.0.4",
     "rollup-plugin-vue": "^5.1.6",
     "vue": "^2.6.11",
     "vue-template-compiler": "^2.6.11"

package.json

@@ -1,6 +1,7 @@
-import babel from 'rollup-plugin-babel';
+import babel from 'rollup-plugin-babel'
 import commonjs from 'rollup-plugin-commonjs'
 import VuePlugin from 'rollup-plugin-vue'
+import { uglify } from "rollup-plugin-uglify"
 
 export default {
   input: 'src/main.js',
@@ -15,6 +16,7 @@ export default {
       runtimeHelpers: true,
       sourceMap: true,
       extensions: ['.js', '.jsx', '.es6', '.es', '.mjs', '.vue'],
-    })
+    }),
+    uglify()
   ]
 };