Update babel monorepo to v7.7.0

Author: renovate-bot

package.json

@@ -40,9 +40,9 @@
   },
   "homepage": "https://sutanlab.js.org/simple-webstorage",
   "devDependencies": {
-    "@babel/cli": "7.6.4",
-    "@babel/core": "7.6.4",
-    "@babel/preset-env": "7.6.3",
+    "@babel/cli": "7.7.0",
+    "@babel/core": "7.7.0",
+    "@babel/preset-env": "7.7.0",
     "jest": "24.9.0",
     "webpack": "4.41.2",
     "jsdom": "15.2.0",