feat(package): add umd version

package.json

@@ -7,6 +7,12 @@
   "type": "module",
   "main": "dist/esm/index.js",
   "module": "dist/esm/index.js",
+  "jsdelivr": "dist/umd/index.js",
+  "unpkg": "dist/umd/index.js",
+  "exports": {
+    "umd": "./dist/umd/index.js",
+    "default": "./dist/esm/index.js"
+  },
   "types": "dist/esm/index.d.ts",
   "license": "MIT",
   "repository": {
@@ -67,6 +73,7 @@
     "rollup-plugin-livereload": "^2.0.5",
     "rollup-plugin-postcss": "^4.0.2",
     "rollup-plugin-serve": "^1.1.0",
+    "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript2": "^0.31.2",
     "rollup-plugin-visualizer": "^5.6.0",
     "start-server-and-test": "^1.14.0",