Upgrade babel to version 7

Author: realityking

Gruntfile.js

@@ -29,7 +29,7 @@ module.exports = function (grunt) {
 		"babel": {
 			options: {
 				sourceMap: false,
-				presets: ["babel-preset-env"]
+				presets: ["@babel/preset-env"]
 			},
 			dist: {
 				files: {

lib/filesize.js

@@ -36,23 +36,23 @@
     var descriptor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
     var result = [],
         val = 0,
-        e = void 0,
-        base = void 0,
-        bits = void 0,
-        ceil = void 0,
-        full = void 0,
-        fullforms = void 0,
-        locale = void 0,
-        localeOptions = void 0,
-        neg = void 0,
-        num = void 0,
-        output = void 0,
-        round = void 0,
-        unix = void 0,
-        separator = void 0,
-        spacer = void 0,
-        standard = void 0,
-        symbols = void 0;
+        e,
+        base,
+        bits,
+        ceil,
+        full,
+        fullforms,
+        locale,
+        localeOptions,
+        neg,
+        num,
+        output,
+        round,
+        unix,
+        separator,
+        spacer,
+        standard,
+        symbols;
 
     if (isNaN(arg)) {
       throw new TypeError("Invalid number");