support ESM (#42)

* support ESM

* Optimize

package.json

@@ -3,10 +3,13 @@
   "version": "0.9.3",
   "description": "A simple SHA-3 / Keccak / Shake hash function for JavaScript supports UTF-8 encoding.",
   "main": "src/sha3.js",
+  "module": "build/sha3.mjs",
   "devDependencies": {
+    "@rollup/plugin-commonjs": "^28.0.5",
     "expect.js": "~0.3.1",
     "mocha": "~10.2.0",
     "nyc": "^15.1.0",
+    "rollup": "^4.43.0",
     "tiny-worker": "^2.3.0",
     "uglify-js": "^3.1.9"
   },
@@ -14,7 +17,7 @@
     "test": "nyc mocha tests/node-test.js",
     "report": "nyc --reporter=html --reporter=text mocha tests/node-test.js",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
-    "build": "uglifyjs src/sha3.js -c -m --comments --output build/sha3.min.js"
+    "build": "npx rollup -c && uglifyjs src/sha3.js -c -m --comments --output build/sha3.min.js"
   },
   "repository": {
     "type": "git",