修改两处标题翻译 更新认领人

https://github.com/trans4fun/The-Swift-Programming-Language/issues/30
更新认领

认领完成
更新认领 完成认领
Update README.md
Update README.md
Update README.md
补了缺失的Statements
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #31 from playmanme/master

确认认领 语句 statements 小节 玩家
泛型合作翻译认领
Merge branch 'master' of https://github.com/dswwsd/The-Swift-Programming-Language