babel-preset-env is now @babel/preset-env

--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -29,7 +29,7 @@
 		"babel": {
 			options: {
 				sourceMap: false,
-				presets: ["babel-preset-env"]
+				presets: ["@babel/env"]
 			},
 			dist: {
 				files: {