chore(deps): update dependency @babel/preset-env to v7.7.6 (#499)

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "@babel/core": "7.7.5",
     "@babel/plugin-proposal-object-rest-spread": "7.7.4",
     "@babel/plugin-transform-object-assign": "7.7.4",
-    "@babel/preset-env": "7.7.5",
+    "@babel/preset-env": "7.7.6",
     "@vue/test-utils": "1.0.0-beta.29",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.0.3",