chore(deps): update dependency @babel/core to v7.6.0

Author: renovate-bot

package.json

@@ -58,7 +58,7 @@
     "styled-system": "^5.1.1"
   },
   "devDependencies": {
-    "@babel/core": "7.5.5",
+    "@babel/core": "7.6.0",
     "@commitlint/cli": "8.1.0",
     "@commitlint/config-conventional": "8.1.0",
     "@storybook/addon-actions": "5.1.11",