chore(package): update babel-preset-airbnb to version 4.5.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
   },
   "devDependencies": {
     "babel-cli": "^6.26.0",
-    "babel-preset-airbnb": "^2.6.0",
+    "babel-preset-airbnb": "^4.5.0",
     "body-parser": "^1.18.3",
     "chai": "^4.2.0",
     "eslint": "^5.9.0",