chore(package): update @babel/preset-env to version 7.7.6

Author: greenkeeper[bot]

examples/package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "@babel/core": "7.7.5",
     "@babel/plugin-proposal-class-properties": "7.7.4",
-    "@babel/preset-env": "7.7.4",
+    "@babel/preset-env": "7.7.6",
     "@babel/preset-react": "7.7.4",
     "babel-eslint": "10.0.3",
     "babel-loader": "8.0.6",