chore(*): add benchmark

package.json

@@ -11,6 +11,7 @@
   },
   "license": "MIT",
   "devDependencies": {
+    "benchmark": "^2.1.4",
     "eslint": "^4.19.1",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-plugin-import": "^2.12.0",
@@ -20,6 +21,7 @@
     "jest": "^23.1.0",
     "jsdoc-to-markdown": "^4.0.1",
     "lerna": "^2.11.0",
+    "microtime": "^2.1.8",
     "rollup": "^0.62.0",
     "rollup-plugin-commonjs": "^9.1.3",
     "rollup-plugin-node-resolve": "^3.3.0",