Add ESM version

Author: vladshcherbin

package.json

@@ -4,7 +4,8 @@
   "version": "0.2.0",
   "author": "Vlad Shcherbin <vlad.shcherbin@gmail.com>",
   "repository": "vladshcherbin/rollup-plugin-delete",
-  "main": "dist/index.js",
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
   "scripts": {
     "lint": "eslint src",
     "build": "rollup -c",

rollup.config.js

@@ -2,10 +2,16 @@ import babel from 'rollup-plugin-babel'
 
 export default {
   input: 'src/index.js',
-  output: {
-    file: 'dist/index.js',
-    format: 'cjs'
-  },
+  output: [
+    {
+      file: 'dist/index.cjs.js',
+      format: 'cjs'
+    },
+    {
+      file: 'dist/index.esm.js',
+      format: 'esm'
+    }
+  ],
   plugins: [
     babel({
       presets: [['@babel/preset-env', { targets: { node: 8 } }]]