removed arity

Removed arity as it has been deprecated in favor of Function.prototype.length
Update README.md
Update README.md
Merge pull request #152 from jsloyer/master

removed arity
Merge pull request #154 from rishabhjain2795/master

Added two new questions. (CSS)
Merge pull request #156 from appleboy/patch

update Chinese-Traditional language.
remove arity.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add some question for chinese traditional.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>