Bump babel-core from 6.26.0 to 6.26.3

Bumps [babel-core](https://github.com/babel/babel) from 6.26.0 to 6.26.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v6.26.0...v6.26.3)

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

Author: dependabot-support

package-lock.json

@@ -18,7 +18,7 @@
     ]
   },
   "dependencies": {
-    "babel-core": "^6.24.1",
+    "babel-core": "^6.26.3",
     "babel-loader": "^7.0.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.24.1",