chore(package): update @babel/preset-env to version 7.3.4

Author: greenkeeper[bot]

package.json

@@ -91,7 +91,7 @@
   "devDependencies": {
     "@babel/cli": "^7.2.3",
     "@babel/core": "^7.3.4",
-    "@babel/preset-env": "^7.3.1",
+    "@babel/preset-env": "^7.3.4",
     "ascjs": "^3.0.0",
     "basichtml": "^0.21.1",
     "coveralls": "^3.0.2",