chore(deps): update babel6 monorepo (#487)

This Pull Request renovates the package group "babel6 monorepo".


-   [babel-preset-stage-2](https://babeljs.io/) (`devDependencies`): from `6.18.0` to `6.24.1`
-   [babel-preset-es2015](https://babeljs.io/) (`devDependencies`): from `6.18.0` to `6.24.1`
-   [babel-core](https://babeljs.io/) (`devDependencies`): from `6.18.2` to `6.26.3`
-   [babel-cli](https://babeljs.io/) (`devDependencies`): from `6.18.0` to `6.26.0`





---

This PR has been generated by [Renovate Bot](https://renovatebot.com).

Author: renovate[bot]

package.json

@@ -50,10 +50,10 @@
   "license": "MIT",
   "devDependencies": {
     "axios": "0.15.2",
-    "babel-cli": "6.18.0",
-    "babel-core": "6.18.2",
-    "babel-preset-es2015": "6.18.0",
-    "babel-preset-stage-2": "6.18.0",
+    "babel-cli": "6.26.0",
+    "babel-core": "6.26.3",
+    "babel-preset-es2015": "6.24.1",
+    "babel-preset-stage-2": "6.24.1",
     "chai": "3.5.0",
     "codecov.io": "0.1.6",
     "cz-conventional-changelog-default-export": "0.0.0-semantically-released.1",