Update README.md

[lahma]

Updated to better reflect features and current state, readability improvements. Please feel free to edit further and merge if/when looks good.

[lahma]

The rich diff mode in Files changed tab should render the new content quite nicely.

[sebastienros]

Looks great

• The very last section could be update
• Wondering if es5 should be listed the same way 2015, ... are in your list, even if just for a single check mark

Even if you don't want to do any changes you should merge

[reuncc]

我发现,如果将this,传递到C#中的 ,过一段时间再传回来, 使用的时候 会有莫名其妙的 对象未实例化错误

[lahma]

The very last section could be update

Last section needs an update or something that you refer as update should be moved?

[lahma]

Merged the initial version, we can surely further improve .