Update example in README (yahoo#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.