Update README.md

小小修改:我觉得设计模式应该可以算得上是四星难度了.
Merge pull request #26 from wuxiaolan91/patch-8

Update README.md
Update README.md

1.把css都改成大写;
2.在###后增加了个空格.@普林,不过我发现在不在三个#后增加空格,从视觉上来说没有什么区别啊?
Merge pull request #28 from wuxiaolan91/patch-10

Update README.md
Update README.md

jQuery也是现在前端必须掌握的了.
Merge pull request #29 from wuxiaolan91/patch-11

Update README.md
add expect
Merge pull request #31 from popomore/master

添加 expect
Merge pull request #1 from JacksonTian/master

pull updates