Improves english of README.md (#4512)
Improves english of README.md (#4512)

Hi. I'm a fan of this project and a native English speaker. I thought I'd take a minute to fix a few English usage issues in the README. Happy to help with other documentation if I have time.
hjin-me/ant-design,icaife/ant-design,elevensky/ant-design,RaoHai/ant-design,vgeyi/ant-design,vgeyi/ant-design,vgeyi/ant-design,ant-design/ant-design,havefive/ant-design,RaoHai/ant-design,zheeeng/ant-design,havefive/ant-design,liekkas/ant-design,liekkas/ant-design,liekkas/ant-design,icaife/ant-design,zheeeng/ant-design,icaife/ant-design,havefive/ant-design,ant-design/ant-design,zheeeng/ant-design,ant-design/ant-design,RaoHai/ant-design,marswong/ant-design,mitchelldemler/ant-design,vgeyi/ant-design,liekkas/ant-design,elevensky/ant-design,havefive/ant-design,ant-design/ant-design,elevensky/ant-design,mitchelldemler/ant-design,RaoHai/ant-design,marswong/ant-design,mitchelldemler/ant-design,marswong/ant-design,hjin-me/ant-design,hjin-me/ant-design,icaife/ant-design,marswong/ant-design,hjin-me/ant-design,elevensky/ant-design,mitchelldemler/ant-design,zheeeng/ant-design