Update dependency @babel/core to v7.8.6

Author: renovate-bot

package-lock.json

@@ -17,7 +17,7 @@
   "private": true,
   "license": "MIT",
   "devDependencies": {
-    "@babel/core": "7.8.4",
+    "@babel/core": "7.8.6",
     "@cypress/code-coverage": "1.12.2",
     "babel-loader": "8.0.6",
     "babel-plugin-istanbul": "5.2.0",