Update example in README (#73)

Author: okuryu

README.md

@@ -40,19 +40,19 @@ serialize({
     bool : true,
     nil  : null,
     undef: undefined,
-    date: new Date("Thu, 28 Apr 2016 22:02:17 GMT"),
-    map: new Map([['hello', 'world']]),
-    set: new Set([123, 456]),
-
-    fn: function echo(arg) { return arg; },
-    re: /([^\s]+)/g
+    inf  : Infinity,
+    date : new Date("Thu, 28 Apr 2016 22:02:17 GMT"),
+    map  : new Map([['hello', 'world']]),
+    set  : new Set([123, 456]),
+    fn   : function echo(arg) { return arg; },
+    re   : /([^\s]+)/g
 });
 ```
 
 The above will produce the following string output:
 
 ```js
-'{"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"undef":undefined,"date":new Date("2016-04-28T22:02:17.000Z"),"map":new Map([["hello","world"]]),"set":new Set([123,456]),"fn":function echo(arg) { return arg; },"re":/([^\s]+)/g}'
+'{"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"undef":undefined,"inf":Infinity,"date":new Date("2016-04-28T22:02:17.000Z"),"map":new Map([["hello","world"]]),"set":new Set([123,456]),"fn":function echo(arg) { return arg; },"re":new RegExp("([^\\\\s]+)", "g")}'
 ```
 
 Note: to produced a beautified string, you can pass an optional second argument to `serialize()` to define the number of spaces to be used for the indentation.