chore(deps): update dependency @babel/core to v7.4.3 (#514)

Author: renovate[bot]

package-lock.json

@@ -29,7 +29,7 @@
     "test:watch": "npm run test -- --watch"
   },
   "devDependencies": {
-    "@babel/core": "7.4.0",
+    "@babel/core": "7.4.3",
     "@wordpress/babel-preset-default": "4.1.0",
     "@wordpress/blocks": "6.2.0",
     "@wordpress/components": "7.2.0",