fix error of GOPATH

export $GOPATH 应为 export GOPATH
Merge pull request #28 from showlovel/master

fix error of GOPATH
rand 已经移到 math/rand下
Merge pull request #29 from showlovel/master

rand 已经移到 math/rand下
add 7.0.md and 7.1.md
Delete 07.1.md

wrong file
add 7.1.md
add 7.1.md
modify 07.1.md
07.1.md
modify embrace
Merge pull request #30 from chidouhu/master

参与翻译，从第七节开始
Update README.md
add 07.2.md, 07.3.md, 07.4.md, 07.5.md
Merge pull request #31 from chidouhu/master

add 07.2.md, 07.3.md, 07.4.md, 07.5.md
add 08.0.md 08.1.md
Merge pull request #32 from chidouhu/master

add 08.0.md 08.1.md
add 08.2.md 08.3.md 08.4.md 08.5.md 08.6.md
Merge pull request #33 from chidouhu/master

add 08.2.md 08.3.md 08.4.md 08.5.md 08.6.md
Update 04.4.md

示例代码中的字符串的双引号使用错误