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

Author: greenkeeper[bot]

package.json

@@ -98,7 +98,7 @@
   "devDependencies": {
     "@babel/cli": "^7.7.5",
     "@babel/core": "^7.7.5",
-    "@babel/preset-env": "^7.4.3",
+    "@babel/preset-env": "^7.7.6",
     "ascjs": "^3.0.0",
     "basichtml": "^1.1.1",
     "coveralls": "^3.0.3",