chore(deps): update dependency babel-core to v6.26.3

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
   ],
   "devDependencies": {
     "babel-cli": "6.26.0",
-    "babel-core": "6.26.0",
+    "babel-core": "6.26.3",
     "babel-plugin-transform-decorators-legacy": "1.3.4",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-stage-0": "6.24.1",