Refine README file
Refine README file

hgl888/crosswalk-web-driver,crosswalk-project/crosswalk-web-driver,chenhengjie123/crosswalk-web-driver,crosswalk-project/crosswalk-web-driver,crosswalk-project/crosswalk-web-driver,hgl888/crosswalk-web-driver,hgl888/crosswalk-web-driver,crosswalk-project/crosswalk-web-driver,chenhengjie123/crosswalk-web-driver,chenhengjie123/crosswalk-web-driver,hgl888/crosswalk-web-driver,hgl888/crosswalk-web-driver,chenhengjie123/crosswalk-web-driver,chenhengjie123/crosswalk-web-driver