Update babel-plugin-transform-runtime requirement from 6.1.18 to 6.23.0

Updates the requirements on [babel-plugin-transform-runtime](https://github.com/babel/babel) to permit the latest version.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/v6.23.0/CHANGELOG.md)
- [Commits](babel/babel@v6.1.18...v6.23.0)

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

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "babel-cli": "^6.4.5",
     "babel-runtime": "^6.11.6",
-    "babel-plugin-transform-runtime": "6.1.18",
+    "babel-plugin-transform-runtime": "6.23.0",
     "babel-istanbul": "^0.12.2",
     "babel-preset-es2015": "^6.3.13",
     "babel-preset-stage-0": "^6.3.13",