refactor: run scripts in parallel for build and clean (#1747)

* refactor: run scripts in parallel for build and clean

* use globs

package.json

@@ -46,6 +46,7 @@
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-import": "^2.11.0",
     "mocha": "^6.2.3",
+    "npm-run-all": "^4.1.5",
     "nyc": "^14.1.0",
     "rimraf": "^3.0.0",
     "rollup": "^0.47.0",
@@ -58,17 +59,17 @@
     "clean:node": "rimraf index.js lib",
     "clean:es": "rimraf es",
     "clean:browser": "rimraf validator*.js",
-    "clean": "npm run clean:node && npm run clean:browser && npm run clean:es",
+    "clean": "run-p clean:*",
     "minify": "uglifyjs validator.js -o validator.min.js  --compress --mangle --comments /Copyright/",
     "build:browser": "node --require @babel/register build-browser && npm run minify",
     "build:es": "babel src -d es --env-name=es",
     "build:node": "babel src -d .",
-    "build": "npm run build:browser && npm run build:node && npm run build:es",
+    "build": "run-p build:*",
     "pretest": "npm run build && npm run lint",
     "test": "nyc --reporter=cobertura --reporter=text-summary mocha --require @babel/register --reporter dot"
   },
   "engines": {
     "node": ">= 0.10"
   },
   "license": "MIT"
-}
+}