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Merge branch 'master' of https://github.com/g0v/sunflower

Conflicts:
	README.md
Merge branch 'master' of https://github.com/g0v/sunflower
Merge branch 'master' of https://github.com/g0v/sunflower
Merge branch 'master' of https://github.com/g0v/sunflower
Merge branch 'master' of https://github.com/g0v/sunflower
Merge branch 'master' of https://github.com/g0v/sunflower
新增bg