chore(dependencies): Bump core-js from 2.5.1 to 2.5.3

Bumps [core-js](https://github.com/zloirock/core-js) from 2.5.1 to 2.5.3.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.5.1...v2.5.3)

package-lock.json

@@ -1983,9 +1983,9 @@
       "dev": true
     },
     "core-js": {
-      "version": "2.5.1",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.1.tgz",
-      "integrity": "sha1-rmh03GaTd4m4B1T/VCjfZoGcpQs=",
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.3.tgz",
+      "integrity": "sha1-isw4NFgk8W2DZbfJtCWRaOjtYD4=",
       "dev": true
     },
     "core-util-is": {

package.json

@@ -34,7 +34,7 @@
     "babel-register": "^6.24.1",
     "cheerio": "^1.0.0-rc.2",
     "commitizen": "^2.9.6",
-    "core-js": "^2.4.1",
+    "core-js": "^2.5.3",
     "cz-conventional-changelog": "^2.1.0",
     "eslint": "^4.0.0",
     "eslint-config-airbnb-base": "^11.2.0",