Bump @babel/core from 7.1.2 to 7.1.5 in /js

Bumps [@babel/core](https://github.com/babel/babel) from 7.1.2 to 7.1.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.1.2...v7.1.5)

Signed-off-by: dependabot[bot] <support@dependabot.com>

js/package.json

@@ -22,7 +22,7 @@
     "ui-select": "^0.19.8"
   },
   "devDependencies": {
-    "@babel/core": "^7.1.2",
+    "@babel/core": "^7.1.5",
     "@babel/polyfill": "^7.0.0",
     "@babel/preset-env": "^7.1.0",
     "babel-loader": "^8.0.4",